mineral
Raw purple amethyst (quartz)
Amethyst, purple variety of quartz (SiO₂)
AI-generated identification · may be incorrectViolet and white, translucent, with a vitreous luster; quartz has Mohs hardness 7, a trigonal crystal structure, and no true cleavage. The small specimen appears rough and fractured.
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Physical properties
Violet and white, translucent, with a vitreous luster; quartz has Mohs hardness 7, a trigonal crystal structure, and no true cleavage. The small specimen appears rough and fractured.
Formation & geological history
Amethyst forms as silica-rich fluids deposit quartz in cavities and veins, with trace iron and natural radiation producing its purple color. It occurs in rocks of many ages, commonly in volcanic geodes and hydrothermal veins.
Uses & applications
Used for jewelry, carvings, and mineral collecting; lower-grade material is also used decoratively.
Geological facts
Amethyst’s color ranges from pale lilac to deep purple and may fade with prolonged heating or sunlight.
Field identification & locations
Look for purple quartz with glassy surfaces and irregular fracture; common sources include Brazil, Uruguay, and Zambia. The photo supports a likely identification but does not show diagnostic crystal faces.
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