mineral

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Purple, violet, to deep lavender; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Purple, violet, to deep lavender
Luster: Vitreous (glassy)

Identified June 7, 2026More mineral →

Explore Amethyst in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: Purple, violet, to deep lavender; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None; Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or geodes within volcanic rock when silicate-rich fluids crystallize. The purple color is caused by irradiation of iron impurities within the quartz lattice.

Uses & applications

Primarily used in jewelry (faceting, cabochons), ornamental decoration, and as a popular metaphysical or collector's specimen.

Geological facts

Amethyst was considered a 'Precious Stone' alongside Diamond and Ruby until large deposits were found in Brazil. The name comes from the Greek 'amethystos,' meaning 'not intoxicated.'

Field identification & locations

Identified by its purple color and ability to scratch glass. Commonly found in Brazil, Uruguay, Zambia, and South Korea. Look for hexagonal crystal points in geode cavities.