mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

AI-generated identification · may be incorrect

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

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

Identified July 18, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in geothermal environments, typically within the vugs or cavities of volcanic rocks (basalt) or hydrothermal veins. The purple color is caused by irradiation of trivalent iron impurities in the quartz structure.

Uses & applications

Primarily used as a gemstone in jewelry, for decorative carvings, and as a popular specimen for mineral collectors and metaphysical practitioners.

Geological facts

The word amethyst comes from the Greek 'amethystos', meaning 'not intoxicated', as the ancient Greeks believed the stone could prevent drunkenness.

Field identification & locations

Look for the characteristic purple color zoning and hexagonal crystal faces. It is commonly found in Brazil, Uruguay, Zambia, and South Korea. Collectors should look for deep, uniform color and high clarity.