mineral
Tumbled quartz pebble, likely iron-stained quartz
Quartz (silicon dioxide, SiO₂), possibly milky quartz with limonite/goethite staining
AI-generated identification · may be incorrectSmall rounded pebble with a pale translucent-to-opaque body, vitreous to waxy luster, and yellow-brown surface staining. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65; the photograph alone cannot confirm exact variety.
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Physical properties
Small rounded pebble with a pale translucent-to-opaque body, vitreous to waxy luster, and yellow-brown surface staining. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65; the photograph alone cannot confirm exact variety.
Formation & geological history
Quartz formed from silica-rich hydrothermal fluids or igneous/metamorphic rocks, then weathered and naturally or artificially rounded. Quartz is geologically widespread and occurs from Precambrian to modern deposits.
Uses & applications
Used for glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces are sold as inexpensive cabochons or specimens.
Geological facts
Iron oxides commonly produce yellow, orange, or brown coatings on quartz. It should scratch ordinary glass but not be scratched by a steel knife.
Field identification & locations
Common in stream gravels, quartz veins, pegmatites, and weathered rock. Confirm with a glass-scratch test, hardness, and lack of cleavage; acid testing is unnecessary. The lower white object appears to be a fingernail, not part of the specimen.
