gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectMohs hardness of 7; purple to violet color; vitreous luster; trigonal crystal system; conchoidal fracture with no true cleavage.
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Physical properties
Mohs hardness of 7; purple to violet color; vitreous luster; trigonal crystal system; conchoidal fracture with no true cleavage.
Formation & geological history
Forms within gas cavities in volcanic rocks through the precipitation of silica-rich solutions containing trace iron impurities.
Uses & applications
Widely used as a gemstone in jewelry, decorative ornamental displays, and prized by mineral collectors.
Geological facts
Amethyst was historically considered one of the cardinal gemstones of high value until large deposits were discovered in Brazil.
Field identification & locations
Easily identified by its distinct purple coloration and hexagonal crystal prism structure; commonly sourced from Brazil, Uruguay, and Zambia.
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