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The reverse: most rocks are made out of minerals. Rocks may contain only one type of mineral or many. Some rocks (such as obsidian or pumice) may not contain any minerals because they are made of volcanic glass. Volcanic glass lacks a crystal structure (defined arrangement of atoms, much like bricks being orderly arranged in a brick wall) and so does not meet the definition of a mineral.

Minerals are naturally occurring, inorganic solids with defined chemical compositions and definite crystal structures.

Rocks are naturally occurring, coherent (not loose grains) solids consisting of minerals and/or glasses.

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13y ago

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