mineral
Amethyst (Cabochon)
Silicon Dioxide (SiO2) with iron impurities
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Purple, violet, mauve; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Purple, violet, mauve
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7 on Mohs scale; Color: Purple, violet, mauve; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins or geodes when silica-rich water cools. The purple color is caused by trace amounts of iron and high-energy radiation (natural or artificial) after the crystal has formed.
Uses & applications
Predominantly used as a gemstone in jewelry, decorative ornaments, and by mineral collectors for its aesthetic and spiritual perceived value.
Geological facts
Amethyst is the birthstone for February. Its name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated', as it was believed to protect the wearer from drunkenness.
Field identification & locations
Identify by its distinct purple hue, inability to be scratched by a steel knife, and lacks cleavage (it breaks with a conchoidal fracture). In the field, it is often found lining the interior of basaltic or volcanic cavities (geodes).
