A metamorphic rock with more than 50% platy and elongated minerals,all of which are visible to the naked eye is a
A) phyllite.
B) gneiss.
C) slate.
D) schist.

Question

A metamorphic rock with more than 50% platy and elongated minerals,all of which are visible to the naked eye is a
A) phyllite.
B) gneiss.
C) slate.
D) schist.

Quizplus · Accepted Answer

The description fits that of a schist, which is a metamorphic rock with more than 50% platy and elongated minerals that are visible to the naked eye. Phyllite and slate have visible minerals, but they typically have less than 50% and are not as elongated or platy as those in a schist. Gneiss has visible minerals, but they are not necessarily platy or elongated.

A Metamorphic Rock with More Than 50% Platy and Elongated