mineral

Polished malachite slab

Malachite, Cu₂CO₃(OH)₂; likely polished and possibly resin-stabilized

AI-generated identification · may be incorrect

Vivid emerald-to-blue-green concentric banding, silky to vitreous polish, opaque, and typically monoclinic. Mohs hardness 3.5–4; specific gravity about 3.6–4.0; perfect cleavage, though the pictured piece is shaped rather than naturally crystalline.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

A secondary copper-carbonate mineral formed by weathering and oxidation of copper deposits, commonly replacing or coating copper sulfides in shallow zones. Most gem-quality material comes from the Democratic Republic of Congo, Zambia, Russia, and Australia; geological ages vary by deposit.

Uses & applications

Used for ornamental slabs, carvings, cabochons, jewelry, pigments, and collectibles; its softness makes it unsuitable for heavy-wear applications.

Geological facts

The dramatic concentric patterns are characteristic botryoidal malachite growth. Blue-green areas may include chrysocolla or azurite, so this may be a malachite–chrysocolla composite rather than pure malachite.

Field identification & locations

Identify by green banding, high density, softness, and a green streak; avoid acids, abrasion, heat, and prolonged moisture. Common localities include Katanga, Zambia, the Urals, and Arizona.