mineral
Tumbled quartz pebble
Quartz, SiO₂; likely iron-stained milky quartz
AI-generated identification · may be incorrectOpaque to translucent cream, tan, and brown mottling with a vitreous-to-waxy polish. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the photo cannot establish the exact variety.
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Physical properties
Opaque to translucent cream, tan, and brown mottling with a vitreous-to-waxy polish. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the photo cannot establish the exact variety.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma and is among Earth’s most common minerals; this rounded specimen was likely naturally water-worn, then tumbled and polished. Its geological age and source cannot be determined from the image.
Uses & applications
Used in jewelry and lapidary crafts; quartz is also important in glassmaking and electronics.
Geological facts
Brown coloration commonly comes from iron-oxide staining or inclusions, rather than a distinct quartz species.
Field identification & locations
Look for hardness near 7, glassy luster, and lack of cleavage; quartz occurs worldwide in veins, pegmatites, and sediment. The smooth shape indicates tumbling or prolonged abrasion.
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Mineral