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Ward's Science Essentials® Gypsum
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Massive sedimentary gypsum with a moh's hardness 2..
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Ward's Science Essentials® Limonite
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Earthy, yellow brown iron ore.
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Ward's Science Essentials® Hematite
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Hemalite is a Massive, dense red to gray, classic example of iron ore.
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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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