Author Question: Match the index mineral with the correct metamorphic grade(s). For these purposes, please remember ... (Read 105 times)

jhjkgdfhk · **on:** Jul 16, 2018

Match the index mineral with the correct metamorphic grade(s). For these purposes, please remember that for a mineral to be part of two metamorphic grades, it should make up at least one-third of both grades.

A) Low grade
B) Low to medium grade
C) Medium to high
D) Medium grade
E) High grade

1) Chlorite
2) Staurolite
3) Muscovite
4) Garnet
5) Sillimanite

Question 2

What role does heat play in creating new minerals or new crystalline structures in metamorphic rocks?

What will be an ideal response?

canderson530 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

Answers: 1) A 2) D 3) B 4) C 5) E

Answer to Question 2

Answer: Heat allows individual ions to migrate more freely between sites in the crystalline structure or migrate into or out of rocks. In the process, new mineral grains will form that are larger than the original grains.