mineral
Amethyst Cluster
Silicon Dioxide (SiO2 with iron impurities)
Hardness: 7 on Mohs scale. Color: Light to deep violet-purple. Luster: Vitreous/glassy. Crystal structure: Trigonal (hexagonal prisms ending in pyramid termination). Cleavage: None, conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Light to deep violet-purple
- Luster
- Vitreous/glassy
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Physical properties
Hardness: 7 on Mohs scale. Color: Light to deep violet-purple. Luster: Vitreous/glassy. Crystal structure: Trigonal (hexagonal prisms ending in pyramid termination). Cleavage: None, conchoidal fracture.
Formation & geological history
Forms within hydrothermal veins and volcanic cavities (geodes) when silica-rich fluids deposit quartz crystals over time, with natural radiation activating iron impurities to create the signature purple hue.
Uses & applications
Popular for lapidary work, jewelry, gemstone collecting, home decor, and crystal healing practices.
Geological facts
Amethyst is the official birthstone for February. Its name comes from the ancient Greek 'amethystos', meaning 'not intoxicated', as the Greeks believed it protected against drunkenness.
Field identification & locations
Identified by its distinctive purple color, glassy luster, and pyramid-like crystal habits forming clusters. Commonly found in Brazil, Uruguay, Madagascar, Zambia, and Russia.
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