Which of the following rock types are not comprised mostly of minerals.
A) sandstone and conglomerate
B) limestone and rock salt
C) coal, obsidian, and pumice
D) granite and basalt

Question

Quizplus · Accepted Answer

Coal, obsidian, and pumice are not primarily composed of minerals. Coal is organic, derived from plant material. Obsidian is volcanic glass, and pumice is a type of volcanic glass with a frothy texture, both lacking a crystalline mineral structure.

Which of the Following Rock Types Are Not Comprised Mostly