mineral: asolid material of Earth's crust with definite composition.
luster: the way light bounces off a mineral´s surface.
streak: the color of the powder left when a mineral is rubbed againts hard, rought surface.
hardness: how well a mineral resist scratching.
cleavege: the tendency of a mineral to break along flat surfaces.
ore: a mineral containing a useful substance.
gem: a mineral valued fore being rare and beautiful.
nonrenewable resource: a resource that cannot be replaced within a short period of time o at all.
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