mineral

Polished malachite tower

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

AI-generated identification · may be incorrect

Typically vivid green with concentric banding, silky to glassy luster, opaque, and Mohs hardness 3.5–4; monoclinic crystals are uncommon, as it usually occurs massive or botryoidal. The dark appearance is likely due to low lighting and polished facets.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a secondary copper mineral in the oxidized zones of copper deposits, commonly replacing or coating other copper minerals. Most specimens formed relatively recently in geological terms, often during weathering of ancient copper ores.

Uses & applications

Used as a decorative stone, carving material, pigment, jewelry, and collector specimen; it is too soft for high-wear jewelry. Avoid dust or ingestion because copper minerals can be toxic if powdered.

Geological facts

Strong green color and banding are diagnostic, though this tower may be polished and shaped. Common sources include the Democratic Republic of the Congo, Zambia, Russia’s Urals, Namibia, Australia, and Arizona.

Field identification & locations

Identify by green banding, moderate softness, opaque appearance, and possible association with blue azurite or copper staining; a streak test is usually pale green. The image alone cannot exclude dyed or coated material.