mineral

Vanadinite on calcite (likely)

Vanadinite, Pb5(VO4)3Cl, with calcite, CaCO3

AI-generated identification · may be incorrect

Bright orange-red, resinous-to-adamantine vanadinite forms hexagonal crystals or crusts on white-to-cream, vitreous calcite. Vanadinite hardness is 2.5–3 Mohs, specific gravity about 6.8–7.1; calcite is hardness 3 and effervesces in dilute acid.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

A secondary lead-vanadium mineral formed by oxidation of lead-ore deposits, commonly coating calcite or barite in arid environments; most classic specimens are Cenozoic or younger in age. The image appears to show natural mineral crusts on pale calcite, though exact identification requires testing.

Uses & applications

Primarily a collector specimen; vanadinite is a minor vanadium ore and is not generally used for jewelry because it is soft and contains lead. Calcite has broad industrial uses in cement, aggregate, lime, and chemical production.

Geological facts

Classic localities include Mibladen, Morocco; Arizona, USA; and other oxidized lead districts. Avoid grinding or ingesting it, wash hands after handling, and keep away from children because vanadinite is lead-bearing.

Field identification & locations

Look for vivid orange-red hexagonal crystals, high density, resinous luster, and association with white calcite; a UV light may produce variable fluorescence. Acid fizzing indicates calcite, while hardness and crystal form help distinguish vanadinite from mimics.