mineral

Amethyst Quartz

Amethyst (SiO2 with Iron impurities)

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

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

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pale lavender to deep violet; 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 within volcanic rock cavities (geodes). The purple color is caused by irradiation, iron impurities, and the presence of trace elements. Found in rocks ranging from several million to over a billion years old.

Uses & applications

Primarily used in jewelry (faceting and cabochons), ornamental carvings, and as a popular specimen for mineral collectors and metaphysical practitioners.

Geological facts

Until the 18th century, amethyst was considered one of the 'Cardinal' gemstones, as valuable as diamond or ruby, until large deposits were discovered in Brazil. The name comes from the Greek 'amethystos,' meaning 'not drunken,' as it was believed to prevent intoxication.

Field identification & locations

Identify by its characteristic purple hue, 6-sided crystal habits (if not tumbled), and its ability to scratch glass. Common locations include Brazil, Uruguay, Zambia, and South Korea. Collectors should look for saturated color and clarity.

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