gemstone
Amethyst
Silicon Dioxide (Quartz variety, SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, purple color, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, purple color, vitreous luster, hexagonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed from silica-rich hydrothermal fluids cooling within gas cavities in igneous rocks, often in volcanic environments.
Uses & applications
Widely used in jewelry, ornamental carvings, and crystal collections.
Geological facts
Its purple color is caused by natural irradiation and trace amounts of iron impurities. It is the traditional birthstone for February.
Field identification & locations
Identified by its distinct purple coloration and quartz hardness; commonly found in Brazil, Uruguay, Zambia, and the United States.
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