Rocks The Reference Tables Page 2
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410. Compare the rate of cooling between obsidian and pegmatite.
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11. Compare the density of mafic and felsic igneous rocks.
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12. Give the range in mineral composition (in percent) of granite. Include 3 examples,
from the most potassium feldspar to the least.
Mineral
Potassium
Quartz
Plagioclase
Biotite
Amphibole
feldspar
feldspar
Granite A
75%
Granite B
Granite C
13. What does the mineral composition of granite tell you about the composition of rocks?
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14. Give the average mineral composition of diorite, gabbro, and peridotite.
MINERAL COMPOSITION
Rock
Plagioclase
Olivine
feldspar
Diorite
Gabbro
Peridotite
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