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a substance that is naturally occurring, inorganic, has a definite chemical composition, is a crystalline
tools for the identification of minerals
hardness, luster, color, streak, cleavage, fracture, cleavage vs. crystal form, and other miscellaneous properties
the color of the powdery residue of a mineral left behind when it is dragged across an unglazed porcelain plate (hardness of porcelain plate = 6); streak is the same color regardless of the presence or absence of impurities on a mineral
streak provides the intrinsic color of a mineral; color is a poor identifier (sulfur is normally yellow and pyrite is normally brassy)
how a mineral grows; of a crystal grows out of an apparent flat cleavage face, the face isn't cleavage - it is crystal form
mineral classification: metals
combined with oxygen = oxide minerals; combined with sulfur = sulfide minerals; not combined with other elements = native (native gold, native copper, etc.)
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