mineral

Rough Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Hardness: 7 (Mohs scale); Color: Pale lilac to deep purple; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Pale lilac to deep purple
Luster: Vitreous (glassy)

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Pale lilac to deep purple; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or as geodes in igneous rocks. The purple color is caused by natural irradiation of iron impurities within the crystal lattice. Most specimens date back millions of years to the volcanic events of their host rock.

Uses & applications

Used extensively in jewelry (faceted or cabochons), as decorative display specimens, and for metaphysical collections. Traditionally considered the birthstone for February.

Geological facts

The name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', as it was once believed the stone could prevent drunkenness.

Field identification & locations

Identify in the field by its distinct purple hue, lack of cleavage, and ability to scratch glass. Commonly found in Brazil, Uruguay, Zambia, and Ontario. Collectors should look for saturated color and minimal fractures.

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