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Ward's Science Essentials® Graphite

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A textbook example of pure crystalline carbon which is extermely soft.

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Selenite is a Clear gypsum mineral with a moh's hardness of 2.

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Talc is the softest know mineral with a moh's hardness of 1, and composed of clay.

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Massive sedimentary gypsum with a moh's hardness 2..

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White to gray, medium to coarse-grained, crystalline.

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