mineral

Likely botryoidal malachite or chrysocolla specimen

Malachite, Cu₂CO₃(OH)₂; possibly chrysocolla, hydrated copper silicate

AI-generated identification · may be incorrect

Appears dark green, rounded and botryoidal with a dull to silky luster; image quality prevents confident identification. Malachite has Mohs hardness 3.5–4, monoclinic crystals, curved banding, and high specific gravity around 3.6–4.0; chrysocolla is softer, about 2.5–3.5, and often blue-green.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Copper-bearing groundwater alters primary copper sulfides near the surface, forming secondary minerals in oxidized zones. These deposits commonly formed during weathering episodes from the Mesozoic to Cenozoic, depending on locality.

Uses & applications

Used as an ornamental stone, carved material, pigment, and collector specimen; malachite is occasionally used in jewelry, though it is relatively soft and acid-sensitive.

Geological facts

Malachite commonly shows concentric green bands and reacts with dilute acid, sometimes fizzing weakly. Chrysocolla is frequently associated with malachite, azurite, limonite, and quartz.

Field identification & locations

Common localities include the Democratic Republic of Congo, Zambia, Russia, Australia, Arizona, and New Mexico. Avoid acids and prolonged water exposure; a clearer photo or streak/color-banding test would improve identification.