mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; white to translucent with a vitreous-to-waxy luster, no visible cleavage, and conchoidal fracture. It has a hexagonal crystal structure, though tumbling has rounded the specimen; specific gravity is about 2.65.
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Physical properties
Mohs hardness 7; white to translucent with a vitreous-to-waxy luster, no visible cleavage, and conchoidal fracture. It has a hexagonal crystal structure, though tumbling has rounded the specimen; specific gravity is about 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks. Quartz is geologically widespread and forms from Precambrian to modern environments; this piece has been mechanically polished and rounded.
Uses & applications
Used as a low-cost jewelry bead, pendant, ornament, and lapidary material; quartz is also important in glass, ceramics, electronics, and construction aggregate.
Geological facts
The cloudy appearance results from microscopic fluid inclusions, fractures, or dispersed mineral impurities. It may be sold as “snow quartz” or “white quartz.”
Field identification & locations
Identify it by its glassy appearance, lack of cleavage, hardness, and ability to scratch ordinary glass; it should not be confused with softer calcite or man-made glass. Common sources include Brazil, Madagascar, the United States, and India.
