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What is chalk made of edible?
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Found at the top of eroded hill of similar color (W. NV). Nearby to chalk and selenite. Looks like it's made up of tiny crystals, but not sure if that's case. What
Chalk: A biological limestone formed from shell debris
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Chalk Rock Type, Composition, Formation, Occurrence & Uses
Chalk: A biological limestone formed from shell debris
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Limestone is a type of sedimentary rock that is mainly made up of a substance called calcium carbonate. Calcium carbonate has the chemical formula, CaCO3. - ppt download
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Chalk: A biological limestone formed from shell debris
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Sample of chalk. Chalk is a soft, white For sale as Framed Prints, Photos, Wall Art and Photo Gifts
Should You Be Worried If You've Been Eating Chalk?
