gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectMohs hardness of 7, violet to purple color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Mohs hardness of 7, violet to purple color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms within gas cavities in volcanic rocks or hydrothermal veins through the precipitation of silica-rich solutions exposed to natural irradiation.
Uses & applications
Widely used as a gemstone in jewelry, decorative carvings, and as highly prized collector mineral specimens.
Geological facts
The purple color results from iron impurities combined with natural irradiation. It was historically considered a precious stone of equal value to diamond and ruby.
Field identification & locations
Easily identified by its distinct purple coloration and quartz crystal structure. Commonly sourced from Brazil, Uruguay, and Zambia.
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