Amethyst (Rough)

Physical Properties

Hardness: 7 (Mohs scale); Color: Purple, violet, or lavender; Luster: Vitreous/Glassy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins and cavities (geodes) of igneous rocks, specifically through the cooling of silica-rich water with trace amounts of iron and irradiation.

Uses & Applications

Primarily used in jewelry making, lapidary arts, and as collector specimens; also popular in metaphysical and spiritual practices.

Geological Facts

Amethyst was considered a 'Precious Stone' until the discovery of large deposits in Brazil in the 19th century. Its name comes from the Greek 'amethystos', meaning 'not intoxicated'.

Field Identification & Locations

Identify in the field by its distinct purple hue and crystal habit; often found in volcanic rock regions like Brazil, Uruguay, Zambia, and Arizona. It will scratch glass but cannot be scratched by a steel knife.

Identified on: 5/16/2026

Mode: Standard