| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |
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2 | 103 Igneous Rock Teaching Collection: Room 325A McCone Hall | |||||||||||||||||||||||||
3 | Note: There are thin sections for each sample also stored in room 325A | |||||||||||||||||||||||||
4 | ||||||||||||||||||||||||||
5 | Spec # | Petrog. Name | Mineral Composition | Structures, Textures, Facies, Etc. | Locality | Remarks | Thin Section Only | |||||||||||||||||||
6 | 103-1 | Andesite, Scoriaceous | Inclusions of tuff and/or altered feldspar (25%), limonite in some vesicles, altered biotite phenocrysts (10%), altered hornblende or augite (5%) | Porphyritic, vesicular with aphanitic groundmass, weathered | Unknown | |||||||||||||||||||||
7 | 103-3 | Tuff, rhyolitic lapilli | Pumice (80%), lithic fragments (15%), biotite and/or hornblende (5%) | Pyroclastic, massive, lapilli size, lithic | West side of lower Sacremento Valley (taken from material used as road fill south of Vacaville), Sacramento Valley, Calif. | |||||||||||||||||||||
8 | 103-4 | Tuff, crystal lithic | Quartz (15%), biotite (5-10%), lithic fragments (20%), plagioclase (10%), tuffaceous matrix (50%) | Pyroclastic, ash to lapilli, massive; probably water-laid | Pine Nut Range, Nevada | |||||||||||||||||||||
9 | 103-7 | Basalt, amygdaloidal | Calcite in vesicles (15%), altered augite? (15%), quartz (less than 5%), groundmass (60%) | Porphyritic with aphanitic groundmass | Houghton Co., Michigan | Termed "Amygdaloidal Diabase" by Wards | ||||||||||||||||||||
10 | 103-8 | Granite, v. Luxullianite | Pink orthoclase with good Carlsbad twinning, quartz, radiating tourmaline | Somewhat spherulitic | Luxullian, Cornwall, England | |||||||||||||||||||||
11 | 103-9 | Basalt: Augite | Augite phenocrysts, no olivine (accord. to H. W.), amygdules of carbonate and chlorite, groundmass probably indeterminate in hand specimen consists of microcrystalline plagioclase, augite, clinozoisite, sphene, and minor amounts of brown hornblende. | Porphyritic with micro-crystalline groundmass, Phenocrysts are medium-grained & compose 50% of rock | In place, 2-4' wide dike in stream bed near where road crosses creek, S. central portion Sec. 35, T6N, R10E, Sutter Creek Quad., Calif. | Probably dike of Logtown Ridge Andesite | ||||||||||||||||||||
12 | 103-12 | Rhyolite: Biotite | Orthoclase (10%), quartz (5%), biotite (5%) | Porphyritic, with microcrystalline groundmass. Phenocrysts constitute 20% of rock | Devil's Gate, Hwy 395, Bridgeport Quad., Calif. | Cannot locate area-SFJ 3/70 | ||||||||||||||||||||
13 | 103-13 | Andesite: Hornblende | Phenocrysts: hornblende (40-50%), plagioclase (40-50%). Amygdules: clinozoisite?, plagioclase (5%), chlorite, epidote. Hornblende needles in groundmass. | Porphyritic with fine-grained to microcrystalline groundmass. Phenocrysts up to 4mm long (minor poikilitic texture with hornblende in plagioclase). | 2 miles NW of Volcano, Jackson Quad., Calif. | |||||||||||||||||||||
14 | 103-14 | Andesite: Biotite, hornblende | Phenocrysts: plagioclase, hornblende, biotite, orthoclase?, quartz (rare) | Porphyritic, microcrystalline groundmass | From well cores, S. side of Marysville Buttes (see map in Williams' U.C. publication on Marysville Buttes), Calif. | |||||||||||||||||||||
15 | 103-15 | Welded tuff, Rhyolitic | Colorless glass shard (90-95%) includes some pumice fragments; orthoclase (5%±), plagioclase (trace), biotite (trace), quartz (1-2%), lithic fragments (minor--old sed. & volcanic rocks?), opaque matter (1-2%) - indeterminate. | Pyroclastic, ash to lapilli size fragments. Some (5-7%) non-vitric material. Fragments have somewhat flattened appearance & rock is well compacted. Lapilli to 2 to 3mm or more. Mostly vitroclastic. | Hwy 20 near junction with Hwy 40, below Emigrant Gap, Calif. | Cannot locate area-SFJ 9/71 | ||||||||||||||||||||
16 | 103-16 | Rhyolite: Biotite | Phenocrysts; plagioclase (all large phenocrysts and almost all of groundmass, twinning poor); NO orthoclase; biotite (5%, partly altered); quartz (none in ts, probably in groundmass and is visible as phenocrysts in hand specimens). | Porphyritic w/ micro-crystalline groundmass (aphanitic w/ handlens). Phenocrysts total 10-15% of rock, but few attain 2-3mm, so that a figure of less than 10% will probably be given. The small plag. laths in groundmass have trachytic structure not visible with handlens. Banded. | South side of Sutter (Marysville) Buttes, Calif. | |||||||||||||||||||||
17 | 103-17 | Rhyolite: Biotite | Phenocrysts (10% of rock) average approx. 1mm; essen. min.: plagioclase (60%-sharply euhedral), quartz (5%, subhedral); char. min. acces.: biotite (35%, euhedral grains); minor acces. min.: epidote (easily visible w/ hand lens, grains up to 1mm long), apatite (euhedral stubby grains difficult to see with hand lens, but some 1mm) | Porphyritic, aphanitic-microcrystalline groundmass. Color: lavender | South side of Sutter (Marysville) Buttes, Calif. | |||||||||||||||||||||
18 | 103-18 | Quartz diorite: Biotite-hornblende-pyroxene | Plagioclase 60-65%, quartz 15-20%, biotite 4-5%, hornblende (replacing augite) 10-25%, hypersthene 9-10%, augite 2-3%. | Holocrystalline, phanerocrystalline, allotriomorphorphic granular, medium grained | Secured from plant at Rocklin, Calif. Said to have come from a quarry on the American River, Sierra Nevada, Calif. | |||||||||||||||||||||
19 | 103-19 | Granite, Alkali, pink | Quartz 25%, microcline 40%, albite 35%, hornblende, biotite, muscovite; minor min: magnetite 1% | Allotriomorphic granular, medium grained | Granite Mountain, Missouri | Supply secured at plant of Rocklin Quarries, Calif. | ||||||||||||||||||||
20 | 103-20 | Gabbro, Saussuritizied hornblende | Plagioclase (40%, saussuritized), hornblende ("60%", developed by uralitization of pyroxene), pyroxene (trace, remnant); minor access. min.: sphene (trace), magnetite (devel. as a result of alteration of hornblende to chlorite); second. min.: chlorite (fully half of the hornblende has been altered to chlorite) | Holocrystalline, phanerocrystalline, allotriomorphorphic granular, medium grained | Large boulders downstream from outcrop where road crosses creek in south central portion Sec. 35, T6N, R10E, Sutter Creek Quad., Calif. | |||||||||||||||||||||
21 | 103-21 placed behnd 103-46 | Quartz diorite: Saussuritized hornblende | Plagioclase (saussuritized), hornblende (poikilitic) | On road near Bear River Bridge, near Colfax on Colfax-Grass Valley road, near Colfax, Calif. | Cannot locate area-SFJ 9/71 | |||||||||||||||||||||
22 | 103-22 | Obsidian | Unknown | |||||||||||||||||||||||
23 | 103-26 | Gabbro, Saussuritized porphyritic | Augite (35%, phenocrysts 1-10mm, partly uralitized), plagioclase (10-20%, saussuritized, up to 3mm, may be chloritized); groundmass: saussuritized plagioclase, chlorite, ilmenite, apatite, augite | Porphyritic with microcrystalline or aphanitic groundmass, saussuritized | From large boulders, downstream from outcrop area, at point where road crosses creek. Surface flows and dikes, or plutonic intrusives (batholiths, stocks, etc.). South central Sec. 35, T6N, R10E, Sutter Creek Quad., Calif. | |||||||||||||||||||||
24 | 103-30 | Granodiorite | Andesine to oligoclase (58%), quartz (20%), biotite (10%, chloritized), muscovite (2%), orthoclase (10%?, interstitial), epidote (trace-F. J. Turner), chlorite after biotite. | Hypidiomorphic-granular, medium-grained | Rocklin Quarries, Calif. | |||||||||||||||||||||
25 | 103-32 | Serpentine | Serpophite, chrysotile, calcite, chromite | On road between Nevada City and Grass Valley, Calif. | See W.T. & G., p.83-84 for "serpophite" Cannot locate area-SFJ 9/71 | |||||||||||||||||||||
26 | 103-33 | Basalt | Phenocrysts: plagioclase (1mm), augite (very small grains, less than 0.05mm). Green alteration may be from olivine, but very few shapes left. Magnetite, calcite, chlorite, pigeonite (virtually uniaxial). | Porphyritic, micro-crystalline groundmass | Berkeley Hills, Calif | |||||||||||||||||||||
27 | 103-35 | Rhyodacite Porphyry | Phenocrysts: plagioclase (sericitized), orthoclase (altered) (orthoclase/plagioclase ratio 1:2), embayed quartz. Groundmass is all quartz and K-feldspar . Original hornblende is now completely replaced by chlorite, sericite, and magnetite. Acces. apatite. | Porphyritic, micro-crystalline groundmass | Pine Nut Range, Nevada | |||||||||||||||||||||
28 | 103-36 | Quartz Monzonite, Porphyritic | Plagioclase (40%), orthoclase (305), quartz (20%), hornblende (10%), magnetite, sphene, hematite, chlorite | Hypidiomorphic granular, medium-grained | Pine Nut Range, Nevada | |||||||||||||||||||||
29 | 103-37 | Olivine Basalt, Altered | Plagioclase phenocrysts to 2mm; groundmass of plagioclase, pyroxene, and completely altered olivine (chlorite or serpentine). Few quartz grains with reaction rims of pyroxene. | Porphyritic, micro-crystalline groundmass | Berkeley Hills, Calif | |||||||||||||||||||||
30 | 103-38 | Laurvigite: (Larvikite; syenite) | Soda-orthoclase/oligoclase; mafics: titanaugite, Ti-rich biotite, hornblende (trace), magnetite or ilmenite, apatite, marcasite or pyrite. Oligoclase and soda-orthoclase in intimate intergrowth create schillerized phenocrysts; anti-perthitic. | Allotriomorphic, coase-grained | Sweden-supply secured at plant of Rocklin Quarries, Calif.; trade name of this imported building stone is "Emerald Pearl". | |||||||||||||||||||||
31 | 103-39 | Andesite: Hornblende, pyroxene | Hornblende (oxidized slightly, reddish in ts. Many show alteration of core), plagioclase, augite (hornblende/augite = 3/1). Can be distinguished with handlens, poor cleavage, stubby, green in small xls., black in large, no reddish color, some yellow-brown). Tridymite in druses. | Porphyritic, micro-crystalline groundmass | Ebbets Pass, Sierra Nevada, Calif. | Could not locate. Too indefinite-SFJ 6/66 | ||||||||||||||||||||
32 | 103-41 | Norite: Hornblende | Hornblende replacing hypersthene, some antigorite? after hypersthene, ilmenite, augite, and biotite. Plagioclase 60%, amphibole 35%, magnetite-apatite-crud 5%, some biotite, pyroxene (hypersthene to augite = 3/1). | Hypidiomorphic granular, medium-grained | Salem, Essex Co., Massachusetts | Ward's description; hornblende diorite | ||||||||||||||||||||
33 | 103-43 | Perlite; Spherulitic | Perlitic glass with rare phenocrysts; quartz, plagioclase, biotite, orthoclase(?) | Perlitite; spherulitic porphyritic with perlitic holohyaline groundmass | Quarry to west of town of Shoshone, Calif. (need 4-wheel drive from Shoshone); prospect on map near NE corner Sec. 35, T22N, R6E, Shoshone Quad., 1:62500. 1951, Calif. | Loc. OK-SFJ 3/68 | ||||||||||||||||||||
34 | 103-44 Not in order, behind 103-21 and in front of 103-49 | Norite, Uralitized | Plagioclase (60%), pyroxene (largely uralitized augite and hypersthene), hornblende (35%, replacing pyroxenes), biotite (rims on ilmenite), ilmenite, chlorite? | Note uralization of pyroxenes | Supply secured from plant at Rocklin Quarries, Calif., but said to have come from near Escondido, San Diego Co., Calif. | |||||||||||||||||||||
35 | 103-46 | Tuff; Rhyolitic, vitric | Glass shards (90-95%), ferromagnesians (5-10%), lithic fragments (1%) | Pyroclastic, massive, fine ash | Reese River, 58 miles toward Austin from Battle Mtn., Nevada | |||||||||||||||||||||
36 | 103-49 | Rhyolite, porphyritic | Quartz (25%), orthoclase (55%), hornblende, biotite (altered to chlorite), pyrite, calcite | Porphyritic, micro-crystalline groundmass | Unknown | |||||||||||||||||||||
37 | 103-50 | Granodiorite | Plagioclase (55%), quartz (25%), biotite (10%), muscovite (5%); perthite + microcline + orthoclase (5%); chlorite, apatite, sphene, epidote (trace). | Hypidiomorphic granular, medium-grained | Woodbury, Vermont | (Wards: Biotite granite or quartz monzonite) | ||||||||||||||||||||
38 | 103-53 | Leucitophyre (Leucite phonolite) | Leucite; Leucite phenocrysts (30%), plagioclase phen. (3%), augite phen. (5%); groundmass (60%): sanidine (40%), biotite (8%), augite (11%), occuring in vesicles (seen only with hand lens) are vonsenite, (Mg, Fe2)2 Fe3BO5. (see Remarks) | Porphyritic, micro-crystalline groundmass | Civita Castellana, Latium, Italy | The vonsenite was identified by Prof. Pabst (Dec. 1964). Vonsenite is found in certain skarns, but it has not been noted previously in volcanic rock. See attached note on X-Ray data (on back) | ||||||||||||||||||||
39 | 103-54 | Leucitophyre (Leucite phonolite) | Phenocrysts: leucite with polysynthetic twinning, embayed dark bordered nosean, zoned aegirine-augite, melanite garnet. Groundmass: sanidine, aegirine-augite | Porphyritic | Probably Rieden, Eifel, Germany | |||||||||||||||||||||
40 | 103-57 | Syenite: Nepheline (Litchfieldite) | Orthoclase = microcline (25%), albite (50%), nepheline (15%), lepidomelane (7%), cancrinite (2%), sodalite, sphene | Litchfield, Maine | ||||||||||||||||||||||
41 | 103-61 | Granodiorite, Hornblende | Plagioclase (40%), quartz (20%), orthoclase (5%?), hornblende (25%), biotite (10%), chlorite, apatite | Hypidiomorphic granular, medium-grained. Faint linear structure. | Unknown | |||||||||||||||||||||
42 | 103-74 | Basalt, Olivine | Plagioclase (30%), augite (15%), olivine (15%); groundmass (40%) | Dense, massive, porphyritic with aphanitic groundmass | French Ranch, Fruto Quad., Calif. Willows-Chico area | |||||||||||||||||||||
43 | 103-88 | Rhyolite, Biotite | Phenocrysts: blue quartz, plagioclase to orthoclase, biotite | Porphyritic, microcrystalline groundmass | Butte, Montana | |||||||||||||||||||||
44 | 103-104 | Quartz Monzonite | Orthoclase (35%), plagioclase (35%), quartz (20%), biotite (10%) | Hypidiomorphic granular, medium-grained. Faint linear structure. | Hetch Hetchy, Lake Eleanor Quad., Calif. Station 526-30 in new North Mountain Tunnel, Hetch Hetchy Water Project | Supercedes old 103-104, discarded because of insufficient specimens. | ||||||||||||||||||||
45 | 103-114 | Porphyry, Quartz | Green Monster Prospect, south of Jerome, Arizona | |||||||||||||||||||||||
46 | 103-119 | Quartz Monzonite | Quartz (35%), orthoclase (20%), plagioclase (35%), biotite (10%), hornblende | Subporphyritic, somewhat weathered with hypidiomorphic granular groundmass | Unknown | |||||||||||||||||||||
47 | 103-122 | Andesite, Hornblende | Hornblende phenocrysts, 15%; groundmass: hornblende, 25% (of rock); plagioclase, 60% (ext. angle 22° to fast direction), some epidote developing from plagioclase groundmass. Phenocrysts to 2.5mm; very fine-grained groundmass. | Dike in granodiorite: hornblende phenocrysts oriented vertical, parallel to dike walls. Porphyritic with microcrystalline groundmass. | Coffee Creek, Trinity Co., Calif. | Locality indefinite; could not locate, 8/70 SFJ | ||||||||||||||||||||
48 | 103-123 | Serpentine, Massive (JF) | Serpentine (85%, alteration of hornblende), plagioclase (5%, altered), prehnite (5%, lighter green area, highly brecciated), chlorite, sphene. | Sheared hornblendite? Holocrystalline (?), allotriomorphic, granular, medium-grained; autobrecciated. Microbrecciated to great extent. | Quarry at road junction, E. side of Tiburon Peninsula, Calif. 750' SE of letter "N" in Tiburon, T1N, R6W, San Quentin Quad., 1:24000, 1959, Calif. | |||||||||||||||||||||
49 | 103-136 | Andesite porphyry: Saussuritized | Phenocrysts: plagioclase (saussuritized), augite (rare); groundmass: plagioclase (partly saussuritized), augite | Porphyritic, with microcrystalline groundmass | Applegate Creek, Central Pacific R.R., Calif. | |||||||||||||||||||||
50 | 103-142 | Pumice, Rhyolite | Mono Craters, Calif? | |||||||||||||||||||||||
51 | 103-150 | Aplite | Quartz (30%), plagioclase (oligoclase 10%), orthoclase + microcline (55%), biotite (5%), sphene (minor). | Dike cutting schist; allotrimorphic-granular, fine-grained | Markleeville, Calif. | Loc. too indefinite; could not locate- SFJ 6/66 | ||||||||||||||||||||
52 | 103-154 | Diabase | Medium-grained | Jersey City, N.J. | ||||||||||||||||||||||
53 | 103-165 | Basalt: Amygdaloidal | Plagioclase with augite and olivine in a groundmass of brown glass, chlorite, and opaques. Amygdules contain zeolites, chalcedony, and chloritic material (?) | Amygdaloidal, hyalo-ophitic texture | Berkeley Hills, Calif | |||||||||||||||||||||
54 | 103-166 | Serpentine | Highly sheared and slickensided | Arlington Ave. at El Cerrito city limits, Calif. | ||||||||||||||||||||||
55 | 103-167 | Basalt, Olivine | Phenocrysts: plagioclase (to 3mm), olivine (to 1mm, partly chloritized). Groundmass: augite, plagiocalse, magnetite | Porphyritic, microcrystalline groundmass | Skyline Blvd. at S end of Grizzly Peak, roadcut on Grizzly Peak Blvd., Berkeley Hills Briones Valley Quad., 1:24000, 1958, Calif. | |||||||||||||||||||||
56 | 103-168 | Basalt, Augite | Phenocrysts of plagioclase and augite, opaques, in groundmass of altered plagioclase and magnetite | Porphyritic | Skyline Blvd. at pass, Berkeley Hills, Calif. | |||||||||||||||||||||
57 | 103-170 | Gabbro | Plagioclase (An50?) 45%, augite (2V = 45. opt.+), hypersthene (red-green pleo.), olivine-trace, grn. biotite(?) altn. with opaques, in augite, little chlorite. | Allotrimorphic-granular, medium grained | East Sooke Peninsula, S. Vancouver Island, British Columbia, Canada | B.C. Dept. Mines stock for Prospectors' sets | ||||||||||||||||||||
58 | 103-171 | Pulaskite: (Syenite) | Orthoclase (80%), biotite (10%), plagioclase (5%), augite (5%, altering to chlorite) | Panidiomorphic-granular coarse-grained | Ymir, SE British Columbia, Canada | Described as "Pulaskite" in Geol. Surv. Canada Report | ||||||||||||||||||||
59 | 103-174 | Quartz Diorite | Plagioclase (60%), quartz (15%), hornblende (20%), biotite (5%), epidote (minor) | Hypidiomorphic-granular, coarse-grained | Unknown | |||||||||||||||||||||
60 | 103-175 | Dacite | Phenocrysts: zoned plagioclase, quartz, brown biotite (interesting poikilitic texture with plagioclase, small xls-laths growing parallel to 001 cleavage of biotite), oxyhornblende with magnetite rims, scattered magnetite (?). Groundmass: abundant small plagioclase laths, devitr. volc. glass? | Porphyritic with microcrystalline groundmass. Phenocrysts euhedral 1/2 mm to 3 or 4 mm | Fulton's Quarry, Reno, Nevada | |||||||||||||||||||||
61 | 103-179 | Granodiorite: Hornblende | Plagioclase (65%), orthoclase (5% - difficult to determine with hand lens), quartz (15%); charac. min.: hornblende + biotite (15-20%, intimately intergrown, hornblende in excess). Minor; allanite (1%), sphene, magnetite. Secondary: chlorite (developing from biotite and hornblende) | Hypidiomorphic-granular, coarse-grained | Moss Beach, Calif. | |||||||||||||||||||||
62 | 103-183 | Granite, Red microcline | Red microcline-perthite, quartz, albite, biotite, muscovite, and minor tourmaline (F. J. T.) | Hypidiomorphic-granular, coarse-grained | Sweden-purchased by South San Francisco plant of Calif. Cut Stone Granite Works. | Trade name: "Imperial Red" | ||||||||||||||||||||
63 | 103-184 | Ganite, Alkali (Aegirine-riebeckite) | Quartz (20-25%), orthoclase (65-70%, probably largely anorthoclase partly exsolved); riebeckite (large xls & microxls orientated w/in orthoclase, bluish green, riebeckite, though toward margins of riebeckite); sphene, allanite, magnetite, garnet. | Hypidiomorphic-granular, medium-grained | Quincy, Mass. Secured from South S. F. plant of Calif. Cut Stone Granite Works. | |||||||||||||||||||||
64 | 103-186 | Quartz Monzonite, Biotite | Biotite; Quartz 35%, orthoclase & plagioclase 50-55% (exact ratio of these minerals is impossible to determine withoutwork, but it appears that the plagioclase equals or exceeds orthoclase), biotite 10-15%, magnetite, and sphene (trace). | Hypidiomorphic-granular, fine-grained | Secured from South San Francisco plant of Calif. Cut Stone Granite works. Said to come from near Porterville, Calif. | |||||||||||||||||||||
65 | 103-194 | Phonolite, Nepheline | Nepheline (30%), aegirine-augite (5%), sphene (trace). Zeolites can be seen under microscope in druzes. | Porphyritic with glassy groundmass. 60-65% coarse-grained phenocrysts to 5mm. | Central crater of Sadiman Volcano, just west of Ngorongoro Crater, Tanzania, Africa | |||||||||||||||||||||
66 | 103-198 | Andesite, Biotite-hornblende | Zoned plagioclase phenocrysts, oxy-hornblende with magnetite rims, brown biotite; magnetite partly oxidized; most of groundmass consists of plagioclase laths showing poorly developed trachytic structure | Poorly developed trachytic structure | Wolkenburg, Siebengebirge, W. Germany | |||||||||||||||||||||
67 | 103-199 | Trachyte: Riebeckite (H. Williams)* | Phenocrysts (30%): Sanidine (20%, neg. relief, low), riebeckite (10%, highly pleochroic blue-green to yellow, low polarizing high relief). Groundmass: sanidine (65%, carlsbad twinning, low neg relief), analcite (?, 5%, high neg relief, isotropic) | Porphyritic with a microcrystalline groundmass. | Hohenburg, Berkum on Rhine, W. Germany | *Labeled rhyolite-liparite on German label | ||||||||||||||||||||
68 | 103-200 | Quartz Diorite | Plagioclase (50%, partly saussuritized), quartz (15%), hornblende (25%), biotite (10%) | Hypidiomorphic-granular, medium-grained | Unknown | |||||||||||||||||||||
69 | 103-201 | Rhyolite, Biotite | Biotite phenocrysts in fine-grained groundmass | Rockland Canyon, Pine Grove Quad., Nevada | 6.5x10^6 years old: KA sample KA 2436, reported in GSA Bull. vol. 84, pp.2489-2510, 1973 | |||||||||||||||||||||
70 | 103-202 | Andesite: Biotite-hornblende-augite | Phenocrysts: plagioclase, sanidine, augite. Groundmass: 65% microlites of feldspar and magnetite, 5% oxyhornblende (magnetite rimmed) and oxybiotite (rimmed with magnetite). Minor:some tridymite lining cavities. | Fine-grained porphyritic with an aphanitic groundmass. Phenocrysts are mostly between 1/2 and 1 mm (largest is 12 mm) | Stenzelberg, Siebengebirge, Germany | |||||||||||||||||||||
71 | 103-204 | Quartz diorite: Hornblende, biotite (H.W.) | Plagioclase (55%), quartz (10%), hornblende (20%), biotite (15%), magnetite (2%), pyrite. | Hypidiomorphic (?) granular, fine to medium-grained. Holocrystalline, phanerocrtstalline | Unknown | Tonalite | ||||||||||||||||||||
72 | 103-207 | Basalt, Olivine | Phenocrysts (15%): olivine (10%, with iddingsite alteration), plagioclase (5%). Groundmass (85%): plagioclase (45%), augite (40%, intergranular between euhedral plagioclase). Iron ore (2%). | Porphyritic with a fine-grained, pilotaxitic or trachytic groundmass | "Basalt" block quarry on Capt. J. McDonalds Ranch, E of Santa Rosa, Calif. | |||||||||||||||||||||
73 | 103-208 | Diotirte | Black and white | Los Angeles Co., Calif. | ||||||||||||||||||||||
74 | 103-216 | Granite | Quartz (50%), alkali feldspar (40%, mostly orthoclase but a good deal of altered albitic plagioclase), biotite (5%, altered to chlorite in part), muscovite (less than 5%), sphene (trace) | Allotriomorphic-granular, medium-grained | Silesia | |||||||||||||||||||||
75 | 103-225 | Hornblende Diorite | Hornblende, plagioclase, hypersthene?, magnetite, biotite (trace). | Salem, Mass. | ||||||||||||||||||||||
76 | 103-226 | Quartz Diorite, Biotite | Plagioclase (60%), quartz (10%), biotite (20-25%), pyroxene (5%+, hypersthene & augite show diallage parting), hornblende (trace, alteration of pyroxene), apatite (1%, rods in biotite xls. & stubby xls in groundmass), sphene (trace), pyrite (trace), magnetite (abundant but easily visible only on polished faces) | Holocrystalline, hypidiomorphic, medium-grained, Schiller in augite and hypersthene | South America (probably Chile)- secured from S. F. plant of Vermont Marble Co. Trade name "Black Andes" | |||||||||||||||||||||
77 | 103-227 | Basalt, Olivine | Phenocrysts: olivine, augite, plagioclase; groundmass: plagioclase laths with intergranular augite, olivine, and opaques. | Porphyritic with groundmass plagioclase showing a sub-parallel alignment of laths (pilotaxitic texture) | Bradbury Well, W of Shoshone, N central part of Avawatz Mtns. Quad., Calif. | |||||||||||||||||||||
78 | 103-230 | Tuff: Rhyolitic, vitric-crystal-lapilli | Biotite | Vitric-crystal-lapilli | Pine Grove Hills, near Pine Grove, Nevada | |||||||||||||||||||||
79 | 103-241 | Gabbro | Bytownite (about 95%), minor mafics, (could be called "bytownitite") | Medium to coarse-grained | Duluth, Minn. | |||||||||||||||||||||
80 | 103-242 | Porphyry, Felsite | Sanidine; Phenocrysts (30%): plagioclase (15%), sanidine (10%), quartz (5%); groundmass (70%): quartz-feldspar intergrowths | Porphyritic with an aphanitic groundmass | Basalt Rock Co. quarries SE of Napa, Calif. | |||||||||||||||||||||
81 | 103-258 | Tuff, Lithic-lapilli | Lithic fragments (35%), plagioclase and quartz xls (30%), tuffaceous matrix (35%) | Pyroclastic, lapilli size. Multi-colored | California? | |||||||||||||||||||||
82 | 103-262 | Scoria | Groundmass (90%), feldspar phenocrysts (10%) | Oxidized scoriaceous | Bsalt Rock Co. Quarries, SE of Napa, Calif. | |||||||||||||||||||||
83 | 103-263 | Basalt | Feldspar (45%, a few xls as phenocrysts), augite (30%, a few xls as phenocrysts), opaques (25%, magnetite?) | Plagioclase laths strongly aligned (trachytic texture), augite & opaques are concentrated into alternating bands. The rock is mostly microcline but a few phenocrysts of plagioclase and augite are present. | Basalt Rock Co. quarries SE of Napa, Calif. | |||||||||||||||||||||
84 | 103-264 | Vitrophyre | Perlitic volcanic glass with phenocrysts of plagioclase (35%), olivine (a few small phenocrysts), pyroxene? | Porphyritic with a perlitic glassy groundmass | Basalt Rock Co. quarries SE of Napa, Calif. | |||||||||||||||||||||
85 | 103-265 | Andesite, Hornblende | Hornblende, biotite, plagioclase | Porphyritic with aphanitic groundmass. Brecciated with angular fragments in a similar matrix | Jackson Butte, Mokelumne Hill Quad., Calif. | Intrusive auto-breccia | ||||||||||||||||||||
86 | 103-266 & 266A | Serpentine | Hwy 70 (89) between Quincy and Blairsden, about 3/4 mi. W-NW of underpass which is near center of Sec. 25, T24N, R10E, Quincy Quad., 1:62500, Calif. | Loc. OK-SFJ 8/70 | ||||||||||||||||||||||
87 | 103-267 In the excel doc but not in physical file | Diorite | Hornblende (saussuritized gabbro); Hornblende, plagioclase, clinozoisite | |||||||||||||||||||||||
88 | 103-268 | Serpentine, Antigorite | Bastite crystals partly replaced by antigorite in an antigorite matrix (F. J. Turner). | About 100 yds. E of the RR underpass, on back towards RR, Hwy 89, between Quincy and Blairsden, at center of Sec. 25, T24N, R10E, Quincy Quad., Calif. | ||||||||||||||||||||||
89 | 103-269 | Basalt, Olivine | Phenocrysts: plagioclase and olivine (altered to iddingsite in part). Groundmass: plagioclase. | Porphyritic with microcrystalline groundmass. | 1.2 miles from edge of Susanville, on Hwy. towards Chester, Calif. | Cannot locate area-SFJ 7/70 | ||||||||||||||||||||
90 | 103-275 | Syenite: Barkevikite | Barkevikite; Clinozoisite?, prehnite | Hypidiomorphic-granular, medium grained | From large blocks in stream at road crossing just N. of center of S. line. Sec. 25 (containing beniotite "Gem Mine"), T18S, R12E, New Idria, Calif. | |||||||||||||||||||||
91 | 103-278 | Volcanic Breccia: (Prob. dacitic/andesitic) | Plagioclase and mafics are wholly altered (replaced by chalcedony, calcite, phyllosilicate). Silica cement (crypto- to micro-crystalline quartz). | Checked by R. L. Hay 1980 | ||||||||||||||||||||||
92 | 103-279 | Pegmatite, Tourmaline | Tourmaline, quartz, K-feldspar, plagioclase | Pegmatitic | ||||||||||||||||||||||
93 | 103-281 | Camptonite: (Na-Fe amphibole lamprophyre) | Phenocrysts of euhedral titanaugite in a groundmass of plagioclase(?) & acicular microlite of barkevikite; calcite & zeolites in amygdules; iron ore | Porphyritic with a microcrystalline groundmass, somewhat vesicular. | Jakuben, Bohemia | |||||||||||||||||||||
94 | 103-283 | Quartz porphyry | Quartz (10-15%), plagioclase phenocrysts (20%), calcite (40%±), pyrite (5%±) | Porphyritic with a microcrystalline groundmass. Highly calcitized. | On Hwy 299 NE of Redding, 1 mile beyond Furnaceville, Calif. | Cannot locate area-SFJ 9/71 | ||||||||||||||||||||
95 | 103-285 | Quartz diorite | Quartz (35%), plagioclase (40%), hornblende (20%), chlorite (5%), clinozoisite (5%) | Holocrystalline, hypidiomorphic, medium-grained | On road to Iron Mt., W of Redding, E edge of French Gulch Quad., Calif. | Cannot locate area-SFJ 9/71 | ||||||||||||||||||||
96 | 103-291 | Granodiorite porphyry | Quartz, plagioclase, orthoclase | Dike rock (based on field occurance) | NE outlier of Hinkley Hills outlier, Sec. 28, T10N, R2W, Barstow Quad., Calif. | |||||||||||||||||||||
97 | 103-292 | Gabbro, Pyroxene | Plagioclase (40%, An50?), augite (50%, 2v=45, opt +, sligh Ti pleo?) being replaced? by hornblende (grn-brn pleo, 5-10%) and opaques (ilmenite?), olivine (partly altered to serpentine & ? chlorite,iddingsite?, less than 5%) | Dark gray variety, poikilitic, allotiomorphic, granular, medium-grained | NE slope of Iron Mt., NE 1/4 Sec. 18 T9N, R2W, Barstow Quad., Calif. | |||||||||||||||||||||
98 | 103-293 | Gabbro, Altered | Uralitized hornblende (55%), plagioclase (45%) | Poikilitic, allotriomorphic; uralitized | NE slope of Iron Mt., NE 1/4 Sec. 18 T9N, R2W, Barstow Quad., Calif. | Loc. OK--SFJ 3/70 | ||||||||||||||||||||
99 | 103-294 | Aplite: Garnet, muscovite | Quartz, plagioclase, muscovite, garnet | Dikes in hornblende gabbro | NE slope of Iron Mt., NE 1/4 Sec. 18 T9N, R2W, Barstow Quad., Calif. | Loc. OK--SFJ 3/70 | ||||||||||||||||||||
100 | 103-295 | Felsite | In draw NE of road, 1.6 mi. W of Bakersfield turnoff from Hwy 58 north of Barstow on Hwy 266, near W edge of SE 1/4 Sec. 35, T10N, R2W, Barstow Quad., Calif. | Loc. OK--SFJ 3/70 | ||||||||||||||||||||||