mineral
Amethyst Point
Crystalline Silicon Dioxide with Iron impurities (SiO2)
Hardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous/glassy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous/glassy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins and cavities (geodes) when mineral-rich water precipitates quartz over time. The purple color is caused by gamma irradiation of trace iron impurities.
Uses & applications
Widely used for jewelry, lapidary art, crystal healing collections, and as decorative interior specimens.
Geological facts
Amethyst was once considered as valuable as diamonds until large deposits were found in Brazil. The name comes from the Greek 'amethystos', meaning 'not intoxicated'.
Field identification & locations
Identified by its distinctive purple hue and hexagonal crystal habit. Common in Brazil, Uruguay, and Zambia. Collectors look for deep saturation and clarity.
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