A fine-grained, greasy metamorphic rock composed of serpentine is classified as a(n)
A) greenstone.
B) amphibolite.
C) marble.
D) serpentinite.

Question

Quizplus · Accepted Answer

Serpentinite is a metamorphic rock composed of serpentine, which gives it a greasy texture. Greenstone is a term used for various types of green-colored rocks, but it typically refers to igneous rocks. Amphibolite is a metamorphic rock composed of amphibole minerals and plagioclase feldspar. Marble is a metamorphic rock composed of calcite or dolomite minerals. None of the other options fit the description of a fine-grained, greasy rock composed of serpentine.

A Fine-Grained, Greasy Metamorphic Rock Composed of Serpentine Is Classified