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 March 27, 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 rock as gas cavities cool and silica-rich water precipitates. Found in igneous and metamorphic environments across many geological ages.

Uses & applications

Primary use is in jewelry as a gemstone (faceted or cabochon), ornamental carvings, and widely collected by mineral enthusiasts for decorative/spiritual purposes.

Geological facts

Amethyst was considered a 'Cardinal Gem' until the discovery of large deposits in Brazil in the 18th century, which lowered its value. Its name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', due to a belief it protected users from drunkenness.

Field identification & locations

Identify in the field by its distinct purple color and crystal form (6-sided prisms terminating in pyramids). Common locations include Brazil, Uruguay, Zambia, and South Korea. Collectors should look for even color saturation and transparency.

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