Quartz Mineral | Photos, Uses, Properties, Pictures
Quartz sands and finely ground silica sand are used for sand blasting, scouring cleansers, grinding media, and grit for sanding and sawing. ADVERTISEMENT. Chert: Chert is a microcrystalline or cryptocrystalline quartz. It occurs as nodules and concretionary masses and less frequently as a layered deposit. This specimen is about four inches (ten ...
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