mineral

Amethyst quartz point

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent violet body with a vitreous to slightly waxy luster and conchoidal fracture. It has trigonal crystal structure and no true cleavage; the specimen appears partly polished or naturally worn, with possible druzy texture along the edge.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids deposit quartz in cavities and fractures, commonly in volcanic basalt; purple coloration develops through irradiation and iron impurities. Most amethyst formed during relatively young hydrothermal episodes, often associated with Mesozoic volcanic provinces.

Uses & applications

Used as an ornamental stone, in jewelry, carvings, geodes, and mineral collections; modest-quality pieces are also sold for décor and metaphysical purposes.

Geological facts

Amethyst is the purple member of the quartz family and is the February birthstone. Heating can turn it yellow-orange, producing citrine-like material.

Field identification & locations

Identify it by purple transparency, glassy luster, hardness sufficient to scratch ordinary glass, and quartz-like fracture; avoid confusing pale amethyst with fluorite, which is softer and cleaves readily. Common sources include Brazil, Uruguay, Zambia, and Mexico.