Rock Identifier
Botryoidal Smithsonite (Zinc Carbonate (ZnCO3)) — mineral
mineral

Botryoidal Smithsonite

Zinc Carbonate (ZnCO3)

AI-generated identification · may be incorrect

Hardness of 4-4.5 on Mohs scale, typically white, grey, or pastel colors, vitreous to pearly luster, trigonal crystal system with distinctive grape-like botryoidal habit.

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Physical properties

Hardness of 4-4.5 on Mohs scale, typically white, grey, or pastel colors, vitreous to pearly luster, trigonal crystal system with distinctive grape-like botryoidal habit.

Formation & geological history

Forms as a secondary mineral in the oxidation zone of zinc ore deposits, often replacing limestone.

Uses & applications

Primarily used as an ore of zinc and prized by mineral collectors for its unique globular crystal forms.

Geological facts

Named after James Smithson, the founder of the Smithsonian Institution. It frequently exhibits strong fluorescence under UV light.

Field identification & locations

Identified by its botryoidal texture, effervescence in dilute hydrochloric acid, and higher specific gravity than similar quartz formations. Found globally, notably in Mexico, Namibia, and the USA.