Which of the following is NOT a rock type?

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Multiple Choice

Which of the following is NOT a rock type?

Explanation:
Rocks are categorized by how they form into igneous, sedimentary, and metamorphic. A mineral is a single, naturally occurring substance with a definite chemical composition and a crystalline structure. Rocks are made up of minerals—usually a mixture of several minerals—so they are aggregates, not a single mineral. Because of that, mineral does not fit as a rock type, while the other three do. For example, granite is a rock composed mainly of minerals like quartz and feldspar; quartz, by itself, is a mineral, not a rock.

Rocks are categorized by how they form into igneous, sedimentary, and metamorphic. A mineral is a single, naturally occurring substance with a definite chemical composition and a crystalline structure. Rocks are made up of minerals—usually a mixture of several minerals—so they are aggregates, not a single mineral. Because of that, mineral does not fit as a rock type, while the other three do. For example, granite is a rock composed mainly of minerals like quartz and feldspar; quartz, by itself, is a mineral, not a rock.

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