mineral
Amethyst
Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Purple to violet; Luster: Vitreous; Crystal Structure: Trigonal, hexagonal prism; Cleavage: None; Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Purple to violet
- Luster
- Vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: Purple to violet; Luster: Vitreous; Crystal Structure: Trigonal, hexagonal prism; Cleavage: None; Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins and cavities (vugs/geodes) within volcanic rocks, often through the cooling of silica-rich solutions containing trace iron impurities subjected to natural irradiation.
Uses & applications
Used widely in jewelry, gemstone carving, decorative items, and mineral collecting.
Geological facts
Amethyst was historically considered one of the cardinal gemstones of high value until large deposits were discovered in Brazil during the 19th century.
Field identification & locations
Easily identified by its distinct purple coloration and conchoidal fracture. Found globally, with significant deposits in Brazil, Uruguay, Zambia, and the United States.
