mineral

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Hardness: 7 (Mohs scale); Color: Pale lilac to deep purple; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Color: Pale lilac to deep purple
Luster: Vitreous (glassy)

Identified May 30, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 (Mohs scale); Color: Pale lilac to deep purple; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins or as linings inside volcanic geodes. It develops when silica-rich fluids deposit quartz in rock cavities, with natural radiation and iron impurities providing the purple hue.

Uses & applications

Primarily used in jewelry (rings, necklaces), as decorative display specimens, and in metaphysical practices. In industry, high-purity quartz is used in electronics and glass manufacturing.

Geological facts

The name comes from the Greek word 'amethystos', meaning 'not intoxicated', as ancient Greeks believed the stone could prevent drunkenness. The most valuable specimens are termed 'Deep Siberian'.

Field identification & locations

Identify by its six-sided crystal terminations and purple color. Common locations include Brazil, Uruguay, and Namibia. Collectors should look for intense color and clarity without cloudy rutiles.