mineral
Amethyst (Tumbled)
Silicon Dioxide (Quartz) with traces of Iron; SiO2
Hardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous/glassy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Purple to violet, Luster: Vitreous/glassy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or geodes within volcanic basalt. The purple color is caused by natural irradiation of iron impurities within the silicate crystal lattice.
Uses & applications
Used primarily in jewelry, lapidary arts, decorative items, and by metaphysical collectors.
Geological facts
Amethyst was considered a precious stone on par with diamond until large deposits were discovered in Brazil in the 18th century. Its name comes from the Ancient Greek 'amethystos', meaning 'not intoxicated'.
Field identification & locations
Identify by its characteristic purple zoning and hardness. When tumbled, look for color bands and internal fractures. Commonly found in Brazil, Uruguay, Zambia, and South Korea.
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