mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically colorless to white, translucent, and glassy to greasy-lustrous, with irregular fracture rather than cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The image is somewhat blurred, so identification is based on appearance and is not definitive.
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Physical properties
Typically colorless to white, translucent, and glassy to greasy-lustrous, with irregular fracture rather than cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The image is somewhat blurred, so identification is based on appearance and is not definitive.
Formation & geological history
Quartz crystallizes from silica-rich igneous and hydrothermal fluids and commonly occurs in veins, cavities, and metamorphic rocks. It forms from Precambrian to modern geological ages and is widespread worldwide.
Uses & applications
Common quartz is used in glassmaking, ceramics, abrasives, electronics, and engineered stone; attractive crystals are collected, though this small fragment has minimal commercial value.
Geological facts
Milky color results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is highly resistant to weathering and often survives as sand or alluvial pebbles.
Field identification & locations
Look for hardness sufficient to scratch ordinary glass, a glassy luster, conchoidal fracture, and lack of obvious cleavage. Common sources include Brazil, Madagascar, the United States, and quartz veins worldwide.
