mineral

Tumbled malachite

Malachite, Cu₂CO₃(OH)₂

AI-generated identification · may be incorrect

Usually vivid green with concentric or banded light/dark patterns, silky to vitreous luster, and opaque appearance; Mohs hardness 3.5–4, monoclinic crystal system, perfect cleavage, and specific gravity about 3.6–4.0. The rounded, polished form is consistent with a tumbled specimen.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

A secondary copper-carbonate mineral formed by weathering and oxidation of copper sulfide deposits, commonly alongside azurite; most deposits are Cenozoic to older, depending on the host ore. Major sources include the Democratic Republic of the Congo, Zambia, Russia, Australia, and Arizona.

Uses & applications

Used for ornamental carvings, cabochons, beads, pigment, and mineral collecting; it is too soft and acid-sensitive for heavy-wear jewelry. Dust from cutting should not be inhaled because malachite contains copper.

Geological facts

Its green color and banding are distinctive, though dyed materials and “reconstituted malachite” are common. It effervesces weakly in acid and may darken or react with ammonia.

Field identification & locations

Identify by vivid green concentric banding, high density, and softness; a copper-streak test or acid reaction can help, but avoid damaging polished pieces. Natural high-quality material is especially associated with Congo and Zambia.