gemstone
Amethyst Cluster
Quartz (Silicon Dioxide, SiO2)
Hardness of 7 on the Mohs scale, purple to violet color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage, 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 with no true cleavage, specific gravity of 2.65
Formation & geological history
Forms in hydrothermal veins and gas cavities (vugs and geodes) in volcanic rocks from silica-rich solutions at low to moderate temperatures
Uses & applications
Used primarily in fine jewelry, ornamental carvings, crystal healing, and as a popular specimen for mineral collectors
Geological facts
Amethyst was once considered one of the cardinal precious gems alongside diamond, ruby, sapphire, and emerald until large deposits were discovered in Brazil
Field identification & locations
Easily identified in the field by its distinct purple coloration and hexagonal crystal terminations; commonly found in Brazil, Uruguay, Zambia, and the USA
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