mineral

Botryoidal Hemimorphite

Hemimorphite (Zn4Si2O7(OH)2·H2O)

Hardness: 4.5–5 Mohs; Color: Pale blue, green, or white; Luster: Vitreous to pearly; Habit: Botryoidal (grape-like) or mammillary; Crystal System: Orthorhombic; Specific Gravity: 3.4-3.5.

Hardness: 4
Color: Pale blue, green, or white
Luster: Vitreous to pearly

Identified June 13, 2026More mineral →

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Physical properties

Hardness: 4.5–5 Mohs; Color: Pale blue, green, or white; Luster: Vitreous to pearly; Habit: Botryoidal (grape-like) or mammillary; Crystal System: Orthorhombic; Specific Gravity: 3.4-3.5.

Formation & geological history

Formed as a secondary mineral in the oxidized zones of zinc-bearing ore bodies (gossans), often resulting from the weathering of sphalerite. It typically occurs in limestones or dolostones.

Uses & applications

Traditionally used as an ore of zinc; today it is primarily a collector's mineral and is occasionally used in lapidary work for cabochons or unique jewelry pieces.

Geological facts

Hemimorphite exhibits strong pyroelectricity (generates an electric charge when heated) and piezoelectricity. It was historically called 'calamine' before being distinguished from zinc carbonate (smithsonite).

Field identification & locations

Identified in the field by its distinct rounded 'bubble' (botryoidal) texture and light blue to white color. Commonly found in lead-zinc deposits in Mexico, China, and the USA (Congo, New Mexico).

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