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Weight and size of gemstones may still very slightly due to difference in calibration of weighing and measuring scales.)

Quartz is a hard, crystalline mineral composed of silicon dioxide (

SiO2

SiO2

), ranking 7 on the Mohs scale. It is the second most abundant mineral in Earth's crust, appearing in various colors due to impurities, though pure quartz is colorless. It is widely known for its piezoelectric properties, hexagonal crystal system, and common presence in igneous, metamorphic, and sedimentary rocks.