Moh´s Scale of Hardness Tips
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Moh´s Scale of Hardness Tips
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How hard is Calcite?
Hardness = 3 (about the hardness of a penny)
How hard is kyanite?
Hardness = 5 and 7 (different hardness on different axes)
How hard is rhodochrosite?
How hard is brazilianite?
How hard is jadeite?
Hardness = 6.5 to 7 (similar to a steel file)
How hard is gypsum?
Hardness = 2 to 2.5 (roughly the hardness of a fingernail)
How hard is tektite?
Hardness = 5.5 (similar to window glass)