gemstone
Amethyst pendant
Amethyst, purple variety of quartz (SiO₂)
AI-generated identification · may be incorrectThe small purple stone appears faceted and set in metal; identification is visual and uncertain. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no distinct cleavage.
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Physical properties
The small purple stone appears faceted and set in metal; identification is visual and uncertain. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no distinct cleavage.
Formation & geological history
Amethyst forms when iron-bearing quartz crystallizes in gas cavities in volcanic rocks, often much earlier than its host rock; the pictured stone’s source and age cannot be determined.
Uses & applications
Amethyst is used in jewelry and as a collectible gemstone.
Geological facts
Amethyst’s purple color is associated with trace iron and natural irradiation; heating can change it to yellow-orange citrine-like colors.
Field identification & locations
Look for purple color, glassy luster, and hardness sufficient to scratch ordinary glass; confirm with gemological testing because other purple stones may look similar. Amethyst occurs worldwide, notably in Brazil, Uruguay, and Zambia.
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