mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent with a vitreous luster, conchoidal fracture, and no cleavage. The cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities; crystal structure is trigonal.
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Physical properties
Hardness 7 Mohs; white to translucent with a vitreous luster, conchoidal fracture, and no cleavage. The cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities; crystal structure is trigonal.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids and igneous melts, commonly in veins and cavities. Its geological age varies widely; this rounded specimen has been mechanically tumbled and polished.
Uses & applications
Used for lapidary ornaments, carvings, cabochons, metaphysical collectibles, glassmaking, and electronics-grade silica. Milky quartz is generally ornamental rather than a high-value gemstone.
Geological facts
The specimen’s curved, smooth shape and polished surface are human-made; natural quartz typically forms angular crystals or massive vein material. It may be confused with white calcite, which is much softer and reacts with dilute acid.
Field identification & locations
Identify it by its glassy luster, translucent edges, lack of cleavage, and ability to scratch ordinary glass; a steel file should not scratch it readily. Common sources include Brazil, Madagascar, the United States, and alpine hydrothermal veins.
