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The Mohs scale ranks gem and mineral hardness in a range from 1 (least hard – talc) to 10 (hardest of all – diamond). - GIA 4Cs
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The Mohs Hardness Scale: Comparing the Hardness of Minerals
Geology Dust - Mohs scale of mineral hardness Talc is a softest mineral and diamond is a hardest. | Facebook
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Mohs Hardness Scale
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Talc: The mineral Talc information and pictures
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Mohs Scale of Mineral Hardness - The Beading Gem's Journal
