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"STEM kits"
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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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Ward's Science Essentials® Selenite
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Selenite is a Clear gypsum mineral with a moh's hardness of 2.
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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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