gemstone
Tumbled amethyst
Amethyst, purple variety of quartz (SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; dark purple, vitreous luster, trigonal crystal structure, and no cleavage. The specimen is polished and appears opaque to translucent in this lighting.
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Physical properties
Mohs hardness 7; dark purple, vitreous luster, trigonal crystal structure, and no cleavage. The specimen is polished and appears opaque to translucent in this lighting.
Formation & geological history
Forms as quartz crystals in silica-rich hydrothermal fluids, commonly lining volcanic-rock cavities; deposits range from geologically recent to hundreds of millions of years old.
Uses & applications
Used in jewelry, carvings, and decorative or collectible specimens.
Geological facts
Amethyst’s purple color is associated with trace iron and natural irradiation; heating can alter its color.
Field identification & locations
Commonly found in Brazil, Uruguay, Zambia, and other regions. Identify by its purple color, glassy luster, and hardness; the image alone cannot confirm the material.
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