A mineral within a metamorphic rock that can be used to provide a narrow constraint on the temperature and pressure of rock formation is termed a(n)________ mineral.
A)thermal
B)index
C)mafic
D)halide

Question

Quizplus · Accepted Answer

An index mineral is a mineral that forms under specific temperature and pressure conditions and can be used to estimate the metamorphic Grade. Index minerals include minerals such as muscovite, chlorite, and garnet. By identifying the index minerals present in a metamorphic rock, geologists can infer the temperature and pressure conditions that the rock experienced during metamorphism.

A Mineral Within a Metamorphic Rock That Can Be Used