mineral

Tumbled quartz-like pebble

Quartz (silicon dioxide, SiO₂), possibly iron-stained chalcedony

AI-generated identification · may be incorrect

Small rounded brown-gold specimen with a dull to waxy luster and likely microcrystalline texture; quartz hardness is 7 Mohs, with no cleavage and conchoidal fracture. The image is insufficient to confirm exact mineral identity.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Likely naturally weathered or mechanically tumbled silica-rich material; iron-oxide staining produces the brown color. Quartz formed in hydrothermal veins, cavities, or sedimentary deposits over varied geological ages.

Uses & applications

Used as a decorative tumbled stone, lapidary material, and in jewelry; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

A steel knife should not scratch quartz, while quartz can scratch ordinary glass. Chalcedony is cryptocrystalline quartz and commonly has a waxier appearance than transparent crystalline quartz.

Field identification & locations

Common worldwide, including Brazil, Madagascar, India, and the United States. Confirm with hardness, translucency, and a streak test; positive identification may require magnification or testing.