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A rock is a naturally-occurring solid aggregate of one or more minerals, mineraloids [glossary item missing] or in some cases organic material. Sediments are the unconsolidated equivalent of these. Other related materials, including some man-made materials, are included within this categorization, along with the major classifications for meteorites.

Strictly, any naturally formed aggregate or mass of mineral matter, whether or not coherent [glossary item missing], constituting an essential and appreciable part of the Earth's crust. Ordinarily, a consolidated or coherent and relatively hard, naturally formed mass of mineral matter; stone. In instances, a single mineral forms a rock, as calcite, serpentine, kaolin, and a few others but the vast majority of rocks consist of several minerals. It can include glasses and mineraloids eg. obsidian, or solid organic material, e.g., coal.

see also Rock.

Ref: AGI

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