mineral

Amethyst (Druzy Cluster)

Amethyst (Silicon Dioxide with Iron impurities), SiO2

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

Identified March 26, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Pale lavender 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 gas cavities (geodes). The purple color comes from irradiation of trivalent iron (Fe3+) within the quartz structure. These specimens can range from thousands to millions of years old.

Uses & applications

Primarily used in jewelry, as birthstone accessories, and as decorative ornamental pieces. High-quality druzy is used in custom silver and gold settings, while clusters like this are popular for crystal collecting and home decor.

Geological facts

Ancient Greeks believed amethyst could prevent intoxication and the name comes from the Greek 'amethystos', meaning 'not drunken'. It was considered a Cardinal Gem until the discovery of large deposits in Brazil in the 1700s.

Field identification & locations

Identify by its purple hue, hexagonal pointed crystal terminations (even if small), and ability to scratch glass but not topaz. Commonly found in Brazil, Uruguay, Zambia, and Ontario. Collectors look for deep saturation and intact crystal points.

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