mineral
Amethyst crystal
Quartz (SiO₂), purple variety; trigonal crystal system
AI-generated identification · may be incorrectHardness 7 Mohs; translucent purple with vitreous luster and visible internal fractures/inclusions. Quartz has no true cleavage and breaks with conchoidal to irregular fracture; specific gravity about 2.65.
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Physical properties
Hardness 7 Mohs; translucent purple with vitreous luster and visible internal fractures/inclusions. Quartz has no true cleavage and breaks with conchoidal to irregular fracture; specific gravity about 2.65.
Formation & geological history
Forms as quartz crystals in silica-rich hydrothermal fluids, commonly lining cavities in volcanic rocks; many amethyst deposits are Cenozoic, though age varies by locality.
Uses & applications
Used in jewelry, carvings, and mineral collections; lower-grade material is also used decoratively.
Geological facts
Its purple color is associated with trace iron and natural irradiation. The specimen appears to be a natural crystal, though the image alone cannot confirm treatments or locality.
Field identification & locations
Identify by its purple color, glassy luster, hardness, and quartz-like crystal habit; common sources include Brazil, Uruguay, Zambia, and parts of the United States. A small specimen of this apparent quality may sell for roughly $5–$30 USD.
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