mineral
Amethyst Geode
Quartz (Silicon Dioxide, SiO2) with iron impurities
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed in hollow cavities of volcanic rocks or sedimentary deposits from silica-rich hydrothermal fluids cooling over millions of years
Uses & applications
Used primarily in jewelry, ornamental decorative items, and mineral collecting
Geological facts
Amethyst was once considered as valuable as diamond, ruby, and emerald until large deposits were discovered in Brazil
Field identification & locations
Easily identified by its distinctive purple crystal cluster inside a rounded rock cavity; commonly found in Brazil, Uruguay, and parts of the USA
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