mineral

Amethyst

Silicon Dioxide (SiO2)

Hardness 7 on Mohs scale, pale to deep purple/lavender color, vitreous (glass-like) luster, hexagonal crystal system, conchoidal fracture, specific gravity ~2.65

Identified July 22, 2026More mineral →

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Physical properties

Hardness 7 on Mohs scale, pale to deep purple/lavender color, vitreous (glass-like) luster, hexagonal crystal system, conchoidal fracture, specific gravity ~2.65

Formation & geological history

Forms in hydrothermal veins and geodes inside volcanic rocks. Natural irradiation of trace iron impurities gives it its characteristic purple coloration.

Uses & applications

Used widely in lapidary work, wire-wrapping, jewelry making, tumbled stones, and rock collections.

Geological facts

The name comes from the ancient Greek 'amethystos', meaning 'not intoxicated', as the ancient Greeks believed the stone protected its owner from drunkenness.

Field identification & locations

Identified by its purple tone, glass-like fracture surfaces, and inability to be scratched by steel. Commonly found in Brazil, Uruguay, Madagascar, and South Africa.