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quartz

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Sand: Composition, Global Demand, and Environmental Impact

Sand: Composition, Global Demand, and Environmental Impact Sand is a granular material consisting of finely divided mineral particles. While often viewed as an infinite resource, sand is ...

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Agate: The Science, Structure, and History of Banded Chalcedony

Agate: The Science, Structure, and History of Banded Chalcedony Agate is a captivating variety of chalcedony, a form of silica that is either microcrystalline (microscopic crystals) or cr...

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