mineral

Amethyst (Rose de France varieties or Amethystine Quartz)

Silicon Dioxide (SiO2) with iron impurities

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

Hardness: 7 on Mohs scale
Color: Pale lavender to light purple
Luster: Vitreous (glassy)

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pale lavender to light 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 in geodes. The purple color is caused by gamma irradiation of iron impurities within the quartz structure. It can be found in volcanic rocks (basalts) and metamorphic environments.

Uses & applications

Primarily used in jewelry for rings, necklaces, and earrings. Used extensively by collectors, for decorative carvings, and in alternative healing practices.

Geological facts

Amethyst was considered one of the Five Cardinal Gems until large deposits were found in Brazil. The name comes from the Greek 'amethystos', meaning 'not intoxicated', as it was believed to prevent drunkenness.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and translucent lavender color. Frequently found in Brazilian and Uruguayan geodes or as pebbles in river beds.

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