Amethyst (Ametrine variety)

Physical Properties

Hardness: 7 (Mohs scale), Color: Purple to violet (sometimes with yellow/brown tones), Luster: Vitreous (glassy), Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed in hydrothermal veins and cavities (geodes) when silica-rich water cools and crystallizes. The purple color comes from irradiation of iron impurities within the quartz lattice. This specimen appears to be an 'elestial' or 'skeleton' growth crystal.

Uses & Applications

Primary uses include jewelry (gemstones), ornamental carvings, and high-quality mineral specimens for collectors. It is also a very popular stone in spiritual and holistic communities.

Geological Facts

Ancient Greeks believed amethyst could prevent intoxication; the word comes from the Greek 'amethystos', meaning 'not drunken'. This particular specimen shows 'record keeper' or 'growth interference' markings along its facets.

Field Identification & Locations

Identify in the field by its distinct purple hue, hexagonal crystal habit, and its ability to scratch glass but not topaz. It is commonly found in Brazil, Uruguay, and Zambia.

Identified on: 4/13/2026

Mode: Standard