gemstone
Tumbled amethyst
Quartz, SiO₂; purple variety known as amethyst
AI-generated identification · may be incorrectMohs hardness 7; deep purple, vitreous luster, and hexagonal crystal structure, though tumbling has smoothed the surface. The opaque-looking areas may reflect the lighting or inclusions.
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Physical properties
Mohs hardness 7; deep purple, vitreous luster, and hexagonal crystal structure, though tumbling has smoothed the surface. The opaque-looking areas may reflect the lighting or inclusions.
Formation & geological history
Forms in silica-rich hydrothermal fluids and gas cavities in volcanic rocks; its color comes mainly from iron impurities and natural irradiation. Amethyst deposits occur in geologically diverse settings, including geodes formed over millions of years.
Uses & applications
Used in jewelry, ornamental objects, and mineral collections; the small rounded specimen is most likely a decorative or collector piece.
Geological facts
Amethyst is a variety of quartz, not a separate mineral species. Heat can alter its color, sometimes producing yellow citrine-like material.
Field identification & locations
Identify by its purple color, glassy shine, and hardness; common sources include Brazil, Uruguay, Zambia, and Madagascar. A scratch test is best avoided on a polished specimen.
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