mineral
Amethyst
Quartz (SiO₂), purple variety; trigonal crystal system
AI-generated identification · may be incorrectMohs hardness 7; translucent purple with vitreous luster and irregular to conchoidal fracture. The specimen appears to be a small rough fragment; cleavage is absent.
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Physical properties
Mohs hardness 7; translucent purple with vitreous luster and irregular to conchoidal fracture. The specimen appears to be a small rough fragment; cleavage is absent.
Formation & geological history
Amethyst forms when iron-bearing quartz crystallizes in silica-rich fluids, commonly in volcanic-rock cavities. Its age depends on the deposit and cannot be determined from the image.
Uses & applications
Used in jewelry, ornamental carving, and mineral collections; lower-grade material is also used for décor.
Geological facts
Its purple color is associated with trace iron and natural irradiation. Heating can produce yellow-orange citrine-like material.
Field identification & locations
Look for purple color, glassy luster, and hardness sufficient to scratch glass; common sources include Brazil, Uruguay, Zambia, and Madagascar. The image supports a likely amethyst identification but not a precise locality or grade.
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