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

Question

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

Quizplus · Accepted Answer

An index mineral is a mineral that forms under specific temperature and pressure conditions during metamorphism. The presence of certain index minerals within a metamorphic rock can be used to determine the temperature and pressure conditions that existed during the rock's formation. Therefore, the best choice is B, index mineral. Themineral, mafic mineral, and halide mineral do not have this property.

Consult the Figure Below