Naturally occurring,inorganic,solid,definite chemical composition,ordered internal structured substance is called a mineral.
"Naturally occurring" means that people did not make it. Steel is not a mineral
because it is an alloy produced by people. "Inorganic" means that the substance
is not made by an organism. Wood and pearls are made by organisms and thus are not minerals.
"Solid" means that it is not a liquid or a gas at standard temperature and pressure.