Amethyst (Tumbled)

Physical Properties

Hardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins and cavities (geodes) of igneous rocks, particularly basalt. The purple color is caused by gamma irradiation of iron impurities.

Uses & Applications

Commonly used in jewelry (faceting and cabochons), crystal healing, interior decoration, and as a popular entry-level mineral specimen for collectors.

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 in the field by its distinct purple color, hexagonal crystal habits (when raw), and ability to scratch a glass plate. Commonly found in Brazil, Uruguay, and Africa.

Identified on: 5/19/2026

Mode: Standard