mineral

Tumbled green stone, likely malachite or aventurine

Malachite (Cu₂CO₃(OH)₂) or quartz-rich green aventurine (SiO₂ with fuchsite inclusions)

AI-generated identification · may be incorrect

Small polished/tumbled, dark green, vitreous to waxy stone with mottled color. Malachite has Mohs hardness 3.5–4 and specific gravity ~3.6–4.0; aventurine has hardness ~7 and specific gravity ~2.6. The photograph does not resolve diagnostic banding or sparkly inclusions.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Malachite forms as a secondary copper mineral in oxidized zones of copper deposits; aventurine forms when quartz crystallizes with green mica inclusions. Both are geologically young relative to their host rocks and occur in varied ore-forming environments.

Uses & applications

Malachite is used for ornamental objects, beads, and pigment; aventurine is common in carvings, beads, cabochons, and decorative stone. This appears to be a low-cost polished cabochon or tumbled specimen.

Geological facts

Malachite commonly shows concentric light- and dark-green banding and may leave a pale green streak. Green aventurine often shows subtle glitter when rotated under light.

Field identification & locations

A copper-rich region near 13.5°N, 77.5°E makes malachite plausible, though the image alone cannot distinguish it confidently from aventurine or dyed material. Test discreetly: malachite is easily scratched by a steel knife, while aventurine is not; avoid acids because they can damage the polish.