Solid
Inorganic (was never alive)
Naturally occurring (not man made)
Definite Chemical Structure
We differentiate minerals by their:
Streak, Color, Hardness, Specific Gravity, Luster, Cleavage
Galena - PbS
Halite - NaCl
Feldspar - KAlSi3O8
or 
Also know Hornblende, Quartz, Talc, Olivine, Calcite, Biotite,
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