mineral
Tumbled amethyst
Quartz (SiO₂), purple variety colored by trace iron and natural irradiation
AI-generated identification · may be incorrectMohs hardness 7; translucent pale purple with a vitreous luster and irregular fracture. Trigonal crystal structure; no cleavage. The specimen is polished and shaped.
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Physical properties
Mohs hardness 7; translucent pale purple with a vitreous luster and irregular fracture. Trigonal crystal structure; no cleavage. The specimen is polished and shaped.
Formation & geological history
Forms in silica-rich hydrothermal fluids, commonly lining cavities in volcanic rocks; deposits range from geologically young to hundreds of millions of years old.
Uses & applications
Used in jewelry, ornaments, and mineral collections; tumbling improves its smoothness and sheen.
Geological facts
Amethyst is the purple variety of quartz; its color can fade with prolonged heat or strong sunlight.
Field identification & locations
Common sources include Brazil, Uruguay, Zambia, and Madagascar. Identify it by its purple color, glassy luster, and hardness; value depends on color, clarity, size, and finish.
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