If you have an unknown mineral, you can use the Determinative Mineralogy section to browse by physical properties such as hardness, density, or cleavage, or by optical properties, including the color.
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have can use can use the Determinative Mineralogy section to browse
an unknown mineral
the Determinative Mineralogy section to browse by physical properties such as hardness, density, or cleavage, or by optical properties, including the color