mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Purple, violet, or lavender
Luster: Vitreous (glassy)

Identified April 13, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins or as geodes in igneous volcanic rocks. The purple color comes from iron impurities and natural irradiation. Can form in rocks spanning from Precambrian to relatively recent volcanic deposits.

Uses & applications

Primarily used as a gemstone in jewelry (rings, necklaces, earrings) and as decorative specimens for mineral collectors and interior design.

Geological facts

Amethyst was once considered as valuable as diamonds until large deposits were found in Brazil. The name comes from the Greek word 'amethystos', meaning 'not intoxicated', as it was once believed to prevent drunkenness.

Field identification & locations

Identify in the field by its distinct purple color and 6-sided crystal habit. Commonly found in Brazil, Uruguay, South Korea, Russia, and the United States (specifically Arizona).

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