Amethyst (Quartz variety)

Physical Properties

Hardness: 7 (Mohs scale), Color: Purple to violet (zoning visible in this sample), Luster: Vitreous, Crystal Structure: Trigonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins and geodes via precipitation from silica-rich fluids. The purple color comes from irradiation of iron impurities over millions of years.

Uses & Applications

Primarily used as a gemstone in jewelry, decorative ornaments, and by mineral collectors for its aesthetic appeal.

Geological Facts

Amethyst is the birthstone for February. Ancient Greeks believed it could prevent intoxication; the name comes from the Greek 'amethystos', meaning 'not intoxicated'.

Field Identification & Locations

Identify in the field by its distinct purple color, hexagonal crystal shape (if unbroken), and ability to scratch glass. Found commonly in Brazil, Uruguay, and Africa.

Identified on: 4/16/2026

Mode: Standard