| 1. | Azurite is soft, with a Mohs hardness of only 3.5 to 4.
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| 2. | The most common scale of measurement is the ordinal Mohs hardness scale.
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| 3. | "' Christite "'is a mineral with the chemical formula Mohs Hardness Scale.
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| 4. | It is a metallic dark black with a Mohs hardness of 6.0-6.5.
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| 5. | Russellite is yellow or yellow-green in color, with a Mohs hardness of 3?
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| 6. | It is named for the Scottish chemist Mohs hardness is 5 to 5.5.
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| 7. | It has a Mohs hardness of 2.3 and a specific gravity of 6.27.
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| 8. | It has a specific gravity of 1.88 and a Mohs hardness of 2.
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| 9. | It has a Mohs hardness of 5 and a specific gravity of 2.86.
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| 10. | It has a Mohs hardness of 6.5 and a specific gravity of 2.67.
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