mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, rounded and likely water-worn, with a vitreous-to-waxy luster. Quartz has hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity is about 2.65.
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Physical properties
White to translucent, rounded and likely water-worn, with a vitreous-to-waxy luster. Quartz has hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity is about 2.65.
Formation & geological history
Formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous and metamorphic rocks; the pebble shape suggests later transport and abrasion. Quartz is widespread across rocks of many geological ages.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and decorative stone; this small pebble is mainly suitable for collecting or crafts.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, allowing it to persist in river and beach gravels.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and irregular curved fracture surfaces. Quartz occurs worldwide in veins and stream gravels; the photo alone cannot establish its exact source.
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