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Rocks and Minerals Quiz

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Question

Answer

Score/10

1

Which rock undergoes high-grade metamorphism, is foliated, and makes up much of the bedrock in the Bronx? (Give the rock name, not the rock type)

2

Which igneous rock forms on Earth’s surface, has gas pockets, and cannot have any potassium feldspar in its composition?

3

Which intrusive igneous rock(s) could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole? (list all possible rocks)

4

Which mineral property is shown in the diagram above?

5

If a mineral can scratch Talc, Fluorite, and Amphibole, but cannot scratch Olivine, what is its hardness?

6

If the mineral from (5) is white to pink in color with a nonmetallic luster, what is it most likely?

7

List the steps required to change an igneous rock into one of the rocks above

Score/20

8

Mafic rocks make up much of the seafloor, while felsic rocks make up the continents. Which mineral(s) make up most (over 35%) of the seafloor?

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