Author Question: How are foliated metamorphic rocks classified? Describe some of the rock types found at different ... (Read 85 times)

stock · **on:** Jul 15, 2018

How are foliated metamorphic rocks classified? Describe some of the rock types found at different
grades of foliated metamorphic rocks. What will be an ideal response?

Question 2

How are metamorphic rocks classified? What are the two main classifications, and how are they
different from each other? What will be an ideal response?

stano32 · **Reply #1 on:** Jul 15, 2018

Answer to Question 1

Foliated metamorphic rocks can be arranged in order of increasing grain size, perfection of their
foliation, or both. Slate is fine-grained, followed by (in increasingly larger grain size) phyllite and
schist; gneiss displays segregated bands of minerals. Amphibolite is another fairly common foliated
metamorphic rock. Migmatities have both igneous and high-grade metamorphic characteristics

Answer to Question 2

Metamorphic rocks are primarily classified according to their texture. In a foliated texture, platy and
elongate minerals have a preferred orientation. A nonfoliated texture does not exhibit any discernable
preferred orientation of the mineral grains