Bm Hot Sell Rollers Raymond Mill For Calcite Limestone Bentonite

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Mineral talc gypsum calcite fluorite apatite orthoclase quartz hardness value 7.5 8 8.5 9 9.5 10 mineral zircon topaz chrysoberyl sapphire carborundum diamond to test a new specimen, a smooth surface is selected, and rubbed with a tool or standard specimen.A fingernail will scratch to a hardness of 2 , copper penny 3, and penknife 5.

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