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Mohs Hardness Scale - Rock and Mineral Collec...
Includes 9 genuine rocks/minerals/gemstones that are one through nine on the M... Includes 9 genuine rocks/minerals/gemstones that are one through nine on the Mohs Hardness Scale. The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer... more
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