mineral defined
Defining a mineral. A mineral is a naturally occurring inorganic solid, with a definite chemical composition, and an ordered atomic arrangement. This may seem a bit of a mouthful, but if you break it down it becomes simpler.1  Minerals are naturally occurring.2  They are not made by humans. 3  Minerals are inorganic.efining a mineral. A mineral is a naturally occurring inorganic solid, with a definite chemical composition, and an ordered atomic arrangement. This may seem a bit of a mouthful, but if you break it down it becomes simpler. 1  Minerals are naturally occurring. 2  They are not made by humans.