| 31. | It has a Mohs hardness of 2.5 to 3.
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| 32. | It has a Mohs hardness of 3.5 to 4 and a specific gravity is 4.25.
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| 33. | Mordenite is Mohs hardness of 5 and a density of 2.1 g / cm 3.
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| 34. | It is brittle with a Mohs hardness of 5 and a specific gravity of 5.95.
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| 35. | It typically has a specific gravity of around 3 and a Mohs hardness of 4.
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| 36. | Studenitsite has a vitreous luster, a Mohs hardness of 6 and color of light-dirty yellow.
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| 37. | It has a Mohs hardness of 3.5 to 4 and a specific gravity of 2.7.
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| 38. | The gray allotrope of selenium is soft, with a Mohs hardness of 2, and brittle.
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| 39. | It has a Mohs hardness of 5 to 5.5 and a specific gravity of 5.88.
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| 40. | It has a Mohs hardness of 2.5 to 3 and a specific gravity of 6.9.
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