mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender; Luster: Vitreous/glassy; Crystal structure: Trigonal/Hexagonal prism; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

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

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender; Luster: Vitreous/glassy; Crystal structure: Trigonal/Hexagonal prism; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or geodes when silica-rich water cools. The purple color is caused by irradiation of trivalent iron impurities (Fe3+) in the quartz structure. Often found in volcanic basalt cavities.

Uses & applications

Primarily used in jewelry as a semi-precious gemstone, in decorative clusters for home decor, and highly valued by mineral collectors for its metaphysical properties and aesthetic appeal.

Geological facts

Amethyst is the birthstone for February. The name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', as it was believed to protect the wearer from drunkenness.

Field identification & locations

Identify by its characteristic purple color and hexagonal crystal terminations. Common locations include Brazil, Uruguay, and Zambia. Small clusters as seen here are often found within larger amethyst geodes.