mineral
Amethyst (as a jewelry accent)
Amethyst (Silicon Dioxide SiO2 with Iron impurities)
Hardness: 7 on Mohs scale; Color: Purple, violet, to deep lavender; Luster: Vitreous (glass-like); Crystal structure: Trigonal (Hexagonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Purple, violet, to deep lavender
- Luster
- Vitreous (glass-like)
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Physical properties
Hardness: 7 on Mohs scale; Color: Purple, violet, to deep lavender; Luster: Vitreous (glass-like); Crystal structure: Trigonal (Hexagonal); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins and basaltic geodes. Secondary mineralization occurs when silica-rich water flows through rock cavities, often over millions of years.
Uses & applications
Primarily used as a gemstone in jewelry (rings, brooches, necklaces) and for specimen collecting. High-grade pieces are faceted, while others are carved or tumbled.
Geological facts
Formerly considered one of the 'Cardinals' or most precious gems alongside ruby and diamond until large deposits were found in Brazil. It is the birthstone for February.
Field identification & locations
Identify by its distinct purple hue and crystal clarity. Often found in South America (Brazil, Uruguay) and Africa. In jewelry, look for high clarity and deep saturation in the purple color.
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