Mineral - any naturally occurring homogeneous solid , Streak - the color of a mineral when powdered, Moh's Scale of Hardness - Hardness is measured on this scale, Cleavage - Minerals that break with smooth edges, Fracture - Minerals that break in a irregular pattern, Color - Poor property to rely on for mineral identification , Hardness - Resistance of mineral to scratching , Luster - Ability of a mineral to reflect light,

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