mineral
Amethyst Crystal Point
SiO2 (Silicon Dioxide with iron impurities)
Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender; Luster: Vitreous/glassy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Purple, violet, or lavender
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7 on Mohs scale; Color: Purple, violet, or lavender; Luster: Vitreous/glassy; Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Forms in hydrothermal veins and geodes. The purple color is caused by irradiation of trivalent iron (Fe3+) in the quartz structure. Most specimens are from the Phanerozoic eon.
Uses & applications
Extensively used in jewelry (faceting and cabochons), crystal healing rituals, home decor, and mineral collections.
Geological facts
Amethyst was once considered one of the 'Cardinal Gems' alongside diamond and ruby, until large deposits were found in Brazil. Its name comes from the Greek 'amethystos', meaning 'not intoxicated'.
Field identification & locations
Identified by its distinctive purple hue and hexagonal crystal habit. Found globally with significant deposits in Brazil, Uruguay, and Zambia. Collectors look for deep saturation and clarity.
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