mineral

Tumbled green stone, likely malachite

Malachite (basic copper carbonate, Cu₂CO₃(OH)₂)

AI-generated identification · may be incorrect

Polished/tumbled, opaque vivid green with darker banding or swirls and a vitreous-to-waxy luster; Mohs hardness 3.5–4, monoclinic crystal system, perfect cleavage, specific gravity about 3.6–4.0. The image is blurred, so identification is provisional; dyed green chalcedony or aventurine are alternatives.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Malachite forms as a secondary copper-mineral coating in oxidized zones of copper deposits, commonly alongside azurite; most specimens are geologically young relative to their host ores. Major sources include the Democratic Republic of Congo, Zambia, Russia, Australia, and Arizona, USA.

Uses & applications

Used for carvings, cabochons, beads, decorative objects, and historically as a green pigment; it is too soft and cleavage-prone for heavy-wear jewelry.

Geological facts

Natural malachite commonly shows concentric eyes, curved banding, and color variation from pale to deep green. Avoid inhaling dust or ingesting material, as copper compounds can be toxic.

Field identification & locations

Check for characteristic banding, unusually high density, and a green streak; acid may produce slight effervescence, but testing can damage the piece. Uniform neon-green color may indicate dyeing.