mineral

Tumbled malachite

Malachite, Cu₂CO₃(OH)₂

AI-generated identification · may be incorrect

Green, opaque, vitreous to silky luster with characteristic dark and light concentric banding; Mohs hardness 3.5–4, monoclinic crystals, perfect cleavage, and specific gravity about 3.6–4.0. The rounded, glossy shape indicates tumbling and polishing.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

A secondary copper carbonate mineral formed 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 the Congo, Zambia, Russia, Australia, and Arizona.

Uses & applications

Used as an ornamental stone, cabochon, beads, carvings, pigment, and collector specimen; it is generally unsuitable for everyday jewelry because it is soft and sensitive to acids.

Geological facts

Its vivid green color comes from copper; concentric banding reflects changing growth conditions. Dust and powders can be toxic, so avoid cutting, grinding, or ingesting it.

Field identification & locations

Identify by intense green color, layered or orbicular banding, high density, and lack of fizz with dilute acid; do not lick or use abrasive tests. Common market pieces are polished or tumbled.