mineral

Amethyst (Tumbled)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Purple, violet, lavender; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

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

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Purple, violet, lavender; 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 cool and crystallize. The purple color comes from irradiation, iron impurities, and the presence of trace elements.

Uses & applications

Used in jewelry, decorative ornaments, healing crystal collections, and as a birthstone for February.

Geological facts

Amethyst was as highly valued as diamonds until the 19th century when large deposits were found in Brazil. The name comes from the Ancient Greek word 'amethystos', meaning 'not intoxicated', due to a belief it prevented drunkenness.

Field identification & locations

Identify by its characteristic purple hue and inability to be scratched by steel. Commonly found in Brazil, Uruguay, and Madagascar. As a tumbled stone, it lacks original crystal faces but retains its color and hardness.