mineral
Tumbled amethyst
Quartz, SiO₂; purple coloration from trace iron and natural irradiation
AI-generated identification · may be incorrectMohs hardness 7; translucent purple with vitreous luster and no cleavage, typically with hexagonal crystal structure. The rounded shape and polish indicate tumbling.
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Physical properties
Mohs hardness 7; translucent purple with vitreous luster and no cleavage, typically with hexagonal crystal structure. The rounded shape and polish indicate tumbling.
Formation & geological history
Amethyst forms as quartz crystals in silica-rich hydrothermal fluids, commonly lining cavities in volcanic rock; deposits span a wide range of geological ages.
Uses & applications
Used in jewelry, decorative objects, and mineral collections.
Geological facts
Amethyst is the purple variety of quartz; its color can fade with prolonged exposure to strong sunlight.
Field identification & locations
Identify by its purple color, glassy luster, hardness, and lack of cleavage. Common sources include Brazil, Uruguay, Zambia, and other quartz-bearing regions.
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