mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with trace Iron (Fe)
Hardness: 7 (Mohs scale); Color: Purple with white or gray bands; Luster: Vitreous when polished; Crystal Structure: Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Purple with white or gray bands
- Luster
- Vitreous when polished
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Physical properties
Hardness: 7 (Mohs scale); Color: Purple with white or gray bands; Luster: Vitreous when polished; Crystal Structure: Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or cavities within hollow geodes, often in basaltic rocks. The white bands are typically milky quartz that grew in layers with the purple amethyst.
Uses & applications
Commonly used in jewelry, as tumbled pocket stones, in decorative home decor, and for spiritual or metaphysical collections.
Geological facts
Chevron amethyst is a combination of amethyst and white quartz, creating a V-shaped or 'zigzag' banded pattern. The purple color comes from natural irradiation and iron impurities.
Field identification & locations
Look for alternating bands of purple and white quartz. It is commonly found in Brazil, Uruguay, Namibia, and India. Collectors value specimens with high color contrast and well-defined patterns.
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