Luster: the way light bounces off a mineral's surface.
Streak: the color of the powder left when a mineral is rubbed against a hard, rough surface.
Hardness: how well a mineral resists scratching.
Cleavage: the tendency of a mineral to break along flat surfaces.
Ore: a mineral containing a useful substance.
Gem: a mineral valued for being rare and beautiful.
Nonrenewable resource: a resource that cannot be replaced within a short period of time or at all.
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