mineral

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony

AI-generated identification · may be incorrect

Hardness about 7 Mohs; tan to brown, dull-to-waxy luster, fine-grained with no visible cleavage. Its rounded shape and abrasion marks indicate natural water-worn or tumbled material; exact identification is limited by the photograph.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as silica-rich material in sedimentary veins, cavities, or chert layers, then weathered and rounded by transport; geological age cannot be determined visually. Common in river gravels, beaches, and quartz-bearing sedimentary terrains.

Uses & applications

Quartz pebbles are used decoratively, in landscaping, rock tumbling, aggregate, and occasionally cabochons or craft pieces. This specimen appears common and has little commercial value.

Geological facts

The whitish crust may be weathered silica, clay, or mineral staining; the brown coloration likely comes from iron oxides. A glass-scratching test can support quartz identification, but it may damage the specimen.

Field identification & locations

Look for glassy or waxy silica, hardness near 7, and absence of cleavage; quartz should not be scratched by a steel knife. Common sources include quartz veins, chert beds, and gravel deposits worldwide.