luster: the way ligth bounces off a mineral surface.
streak: the color of the powder left when a mineral is rubbed against a hard, rough surface.
hardness: how well a mineral resist scratching.
cleavage: the tendency of a mineral to break along flat surface.
ore: amineral containing useful substance.
gem: a mineral valued from being rare and beautiful.
nonrenewable resource: a resource that cannot be replace within a short period of time or at all.
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