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"STEM kits"
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Ward's Science Essentials® Limestone
Limestone is a gray calcium carbonate that will fizz with dilute HCl.
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Ward's Science Essentials® Tufa
Carbonate rock formed by the precipitation from water.
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Ward's Science Essentials® Pink Gneiss
Pink Gneiss is foliated pink and black bands of biotite.
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Ward's Science Essentials® Red Slate
Slaty metamorphic rock containing hematite giving it its red color.
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