| 21. | Marble, travertine, and onyx are at about 6 on the Mohs scale.
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| 22. | The mineral has a metallic Mohs scale.
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| 23. | The material was first proposed in 1985 by Mohs scale was first proposed in 1989.
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| 24. | The hardest stone frequently carved is granite, at about 8 on the Mohs scale.
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| 25. | The Mohs scale of marble is roughly 3, where as quartz are usually at 7.
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| 26. | I found stuff online that puts them both in about the middle of the Mohs scale.
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| 27. | The mineral has a pale yellow color and has a hardness of 5 on Mohs scale.
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| 28. | Knorringite is a greenish blue color with a Mohs scale of mineral hardness of six to seven.
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| 29. | It has a metallic luster and a hardness on the Mohs scale of 2 ( gypsum ).
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| 30. | Its hardness on the Mohs scale is 1.5-2, basically between talc and gypsum.
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