gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, and no true cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, and no true cleavage.
Formation & geological history
Forms within gas cavities in volcanic rocks through hydrothermal processes involving silica-rich solutions and iron impurities.
Uses & applications
Widely used in jewelry, ornamental carvings, and as a popular collectible mineral specimen.
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 distinct purple color and conchoidal fracture; commonly found in Brazil, Uruguay, and parts of the USA.
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