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A naturally-occurring, inorganic solid that has a crystal structure and a definite chemical composition.


Not formed from living things or the remains of living things.


A solid in which the atoms are arranged in a pattern that repeats again and again.


The color of a mineral's powder.


The way a mineral reflects light from its surface.

Mohs hardness scale

A scale ranking ten minerals from softest to hardest; used in testing the hardness of minerals.


A mineral's ability to split easily along flat surfaces.


The way a mineral looks when it breaks apart in an irregular way.

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