Mineral

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Mineralsearch for term: Any naturally occurring inorganic substance with an arrangement of atoms (chemical structure) that can be exact, or can vary within limits. Quartz and feldspar are examples of minerals. Elements that occur naturally as crystals are also considered minerals. A rock is mainly composed of minerals. Adapted, in part, from The Mineral and Gemstone Kingdom. 2003. Glossary. http://www.minerals.net/glossary/glossary.htm. The terms sand, silt, and clay can refer to specific particle sizes of minerals.