mineral

Malachite-stained copper-bearing rock

Malachite, Cu₂CO₃(OH)₂, likely coating or alteration of copper sulfide/host rock

AI-generated identification · may be incorrect

Green to blue-green earthy coating with dull to weakly vitreous luster; malachite hardness 3.5–4, monoclinic crystals, perfect cleavage, and specific gravity about 3.6–4.0. The specimen appears massive and mixed with dark matrix, so exact identification from the image is tentative.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in the oxidized, near-surface zones of copper ore deposits when carbonate-rich groundwater alters primary copper sulfides. Most examples are geologically young relative to their host rocks, commonly forming in veins and weathering zones.

Uses & applications

Used as an ornamental stone, pigment, mineral specimen, and occasionally in jewelry; too impure or massive for high-value gemstones. Copper-bearing material may have economic significance if part of an ore deposit.

Geological facts

Malachite commonly occurs with azurite, chrysocolla, limonite, and native copper, and may show concentric banding or botryoidal surfaces. The green color comes from copper ions.

Field identification & locations

Identify by vivid green color, earthy/botryoidal texture, and association with weathered copper minerals; confirm with hardness, streak, and chemical testing rather than appearance alone. Common localities include the Democratic Republic of Congo, Zambia, Russia, Australia, Arizona, and New Mexico.