Amethyst (Tumbled)

Physical Properties

Hardness: 7.0 Mohs; 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 geodes or hydrothermal veins when silicon-rich solutions cool and crystallize in underground cavities. The purple color is caused by trace amounts of iron and natural irradiation.

Uses & Applications

Used primarily in jewelry (rings, necklaces), as decorative display pieces (geodes/cathedrals), and frequently collected by mineral enthusiasts or for metaphysical uses.

Geological Facts

Amethyst was considered a 'Precious Stone' alongside Diamond, Ruby, and Sapphire until the discovery of massive deposits in Brazil in the 19th century.

Field Identification & Locations

Identify by its distinctive purple color and lack of cleavage (will have wavy, shell-like fractures). Tumbled stones like this are common in rock shops and are often sourced from Brazil or Uruguay.

Identified on: 4/13/2026

Mode: Standard