Minerals are classified according to: Hardness, Specific Gravity (how it compares with the density of water), Color, Luster, Streak, Cleavage and Crystal Form.
The following minerals are categorized according to Hardness. The following chart indicates how you might test a rock for hardness according to Friedrich Moh's scale. 10 is the hardest, and 1 is the softest mineral. (Links are to photographs of the minerals.)
The number at the left indicates the "hardness" of the crystal.
The next column has the hardness item that will scratch the Representative
Mineral (found as a link at the right). (Use your
browser's back button to return to Sci-ber Text.)
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