Which of the following lists of foliated rock types is arranged according to increasing coarseness of texture?
A) slate, phyllite, gneiss, schist
B) slate, amphibolite, schist, phyllite
C) schist, phyllite, gneiss, slate
D) slate, phyllite, schist, gneiss
E) schist, phyllite, amphibolite, gneiss

Question

Quizplus · Accepted Answer

The correct order of increasing coarseness of texture in foliated rocks is from fine-grained to coarse-grained. Therefore, slate, which has the finest grain size, should be followed by phyllite, which is slightly coarser. Schist comes next, followed by gneiss, which has the coarsest texture among the given options. Hence, the correct order is: slate, phyllite, schist, gneiss, which is represented in choice D.

Which of the Following Lists of Foliated Rock Types Is