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Mineral Hardness Talc 1 Gypsum Calcite 3 Fluorite Apatite Feldspar Quartz Topaz 8 Corundum 9 Mechanical Engineers when they see Elon Musk 10

Mineral Hardness Talc 1 Gypsum Calcite 3 Fluorite Apatite Feldspar Quartz Topaz 8 Corundum 9 Mechanical Engineers when they see Elon Musk 10

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