Happy Mineral Monday! This week, we look at the mineral Talc. This soft mineral sits at a 1 on the Mohs Hardness Scale, and when ground up becomes a common household powder. Any guesses what that ...
Sapphire has a Mohs hardeness rating of 9. "With a 5 in the Mohs hardness scale mineral glass is located between acrylic glass and sapphire crystal. Mineral glass with hardened mineral surface and 6-7 ...
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