| 31. | Beryl has a Mohs scale . so their toughness ( resistance to breakage ) is classified as generally poor.
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| 32. | On the Mohs scale, a streak plate ( unglazed porcelain ) has a hardness of 7.0.
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| 33. | The physical property of " hardness " is defined by the non-linear Mohs scale of mineral hardness.
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| 34. | It is soft ( not higher than 2.5 on the Mohs Scale ) and water-soluble.
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| 35. | An example of a well-established fact is that diamond scores 10 on the Mohs scale of hardness.
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| 36. | Published descriptions of these spheres being harder than steel are meaningless in terms of Mohs scale of mineral hardness.
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| 37. | An examination of several Klerksdorp spheres found none to be harder than 5.0 on the Mohs scale.
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| 38. | Greenish gray or bluish green in color, its Mohs scale and a density of approximately 6.44.
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| 39. | The crystals are brittle with a hardness of 5-6 on the Mohs scale and a white streak.
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| 40. | Diamonds are the hardest known naturally occurring substance and rate a 10 on the Mohs scale of mineral hardness.
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