mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectOpaque to translucent white and honey-brown, with a glassy-to-waxy luster and no visible cleavage; quartz has Mohs hardness 7 and a trigonal crystal structure. The smooth shape suggests tumbling or natural water-wear.
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Physical properties
Opaque to translucent white and honey-brown, with a glassy-to-waxy luster and no visible cleavage; quartz has Mohs hardness 7 and a trigonal crystal structure. The smooth shape suggests tumbling or natural water-wear.
Formation & geological history
Quartz crystallizes from silica-rich fluids in veins and cavities, or forms in igneous and metamorphic rocks; it occurs across many geological ages. Brown coloration may come from iron-oxide staining.
Uses & applications
Commonly used for ornamental objects, carvings, jewelry, and mineral collections; quartz also has major industrial uses in glass and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and is resistant to weathering, allowing it to persist in stream gravels and sediments.
Field identification & locations
Look for hardness sufficient to scratch glass, a lack of cleavage, and often irregular fracture. Quartz occurs worldwide; the precise locality and whether this piece is naturally worn or polished cannot be determined from the image.
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