vocabulary about minerals of earth crust

mineral a solid material of earth crust with a definite composition.

luster the way light 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 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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