Which of the following pairs of index minerals do not overlap in metamorphic grade?
A) chlorite and biotite
B) amphibole and garnet
C) staurolite and sillimanite
D) kyanite and pyroxene

Question

Quizplus · Accepted Answer

Staurolite and sillimanite do not overlap in metamorphic grade. Staurolite is commonly found in low-to-medium grade metamorphic rocks, while sillimanite is found in high-grade metamorphic rocks. Therefore, the presence of both minerals together can help geologists determine the range of metamorphic grades present in a rock.

Which of the Following Pairs of Index Minerals Do Not