mineral,n. 1. Any natural inorganic matter that has a definite chemical composition and specific physical properties that give it value <most minerals are crystalline solids>. [Cases: Mines and Minerals 48.C.J.S. Mines and Minerals §§ 4, 140–142.] 2. A subsurface material that is explored for, mined, and exploited for its useful properties and commercial value. 3. Any natural material that is defined as a mineral by statute or caselaw.

[Blacks Law 8th]