mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

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

Identified June 5, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or geodes within volcanic rocks when silica-rich fluids permeate cavities and crystallize over time. Coloration is caused by irradiation of iron impurities.

Uses & applications

Primarily used in jewelry (rings, necklaces, earrings), as decorative specimens for collectors, and in metaphysical practices.

Geological facts

Amethyst was considered a precious stone in ancient times, equal in value to diamond, until large deposits were discovered in Brazil. Its name comes from the Greek word 'amethystos', meaning 'not intoxicated'.

Field identification & locations

Identify by its characteristic purple color, hardness (can scratch glass), and lack of cleavage. Commonly found in Brazil, Uruguay, Zambia, and South Korea.