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can use a hand lens, acid bottle, and other tools to identify the individual minerals within an igneous rock. These minerals give the geologist an idea as to its composition. The size of the minerals shows how much time the crystals had to nucleate and grow. Large crystals indicate a longer amount
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that can explain how the rock formed and crystallized from a melt. It is a branch of
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How to get pressure and temperature from knowing which phases are present
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of igneous rocks, and the connections between these observations and the
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Clausius-Clapeyron with respect to # of phases that can be present
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a pyroxene quadrilateral (trapezoid) diagram might also be good
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high pressure, high temperature laboratories doping of melts
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Most important probably olivine, some others, in T-X space
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