Luster: the way light bounces off 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 usefull 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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