Hardness
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The hardness of a mineral indicates how well it resists scratching and abrasion. It is measured on a numerical scale, from 1 (softest) to 10 (hardest):
Chesterman, p. 27
Sources
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)