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, 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 hydrothermal veins and gas cavities within volcanic rocks as silica-rich solutions cool and crystallize over millions of years.
Uses & applications
Extensively used in high-end and fashion jewelry, spiritual practices, and ornamental carvings.
Geological facts
The purple color is caused by irradiation of iron impurities substituting for silicon in the crystal lattice. It was historically prized as a precious gem equal in value to ruby and emerald until large deposits were discovered in Brazil.
Field identification & locations
Readily identified by its distinct purple coloration and hardness. Common global localities include Brazil, Uruguay, Zambia, and the United States.
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