mineral

Amethyst with Quartz Vein

SiO2 (Silicon Dioxide)

Hardness: 7 on Mohs scale; Color: Purple/Violet with white banding; Luster: Vitreous/Glassy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Purple/Violet with white banding
Luster: Vitreous/Glassy

Identified May 27, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Purple/Violet with white banding; Luster: Vitreous/Glassy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or geodes within volcanic rocks where silica-rich fluids and iron impurities are exposed to natural radiation. The purple color comes from irradiation of iron within the crystal structure.

Uses & applications

Extensively used in jewelry (faceting and cabochons), decoration, spiritual/metaphysical practices, and as a popular collector specimen.

Geological facts

Amethyst is the birthstone for February. Its name comes from the Greek 'amethystos', meaning 'not intoxicated', as it was once believed to prevent drunkenness. The white line seen in this specimen is a quartz vein or 'chevron' banding.

Field identification & locations

Identify by its distinct purple hue and ability to scratch glass (Hardness 7). Commonly found in Brazil, Uruguay, and Africa. Collectors often find these as tumbled stones or in geode form.