sentence: Many rocks are named based on what kinds of minerals they have.
sentences_before: Studying minerals can be useful for figuring out certain things about a rock. Sometimes the shape or size of the mineral can tell something about the rock as well. The type of mineral in a rock can also tell what kind of a rock it is, or what has happened to the rock since it formed.
concept_name: rock
headings: Mineralogy
categories: Geology