mineral

Amethyst (Rose de France)

Silicon Dioxide (SiO2) with iron impurities

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

Hardness: 7 on Mohs scale
Color: Pale lilac or lavender
Luster: Vitreous (glassy)

Identified June 19, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or volcanic geodes when mineral-rich water precipitates silica in hollow cavities. The characteristic purple color comes from irradiation of iron impurities.

Uses & applications

Primarily used in jewelry, as cabochons or faceted stones, and by mineral collectors for home decor and holistic practices.

Geological facts

Amethyst was once considered one of the 'Cardinal Gems' alongside diamond and ruby, until large deposits were found in Brazil in the 18th century, making it more accessible.

Field identification & locations

Identified by its purple hue, hexagonal glass-like appearance, and inability to be scratched by steel. Commonly found in Brazil, Uruguay, and Madagascar.

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