gemstone
Tumbled amethyst
Quartz, SiO₂; purple color typically from trace iron and natural irradiation
AI-generated identification · may be incorrectMohs hardness 7; purple, vitreous luster, trigonal crystal structure, and no cleavage. The specimen is polished, so its natural crystal shape is not visible.
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Physical properties
Mohs hardness 7; purple, vitreous luster, trigonal crystal structure, and no cleavage. The specimen is polished, so its natural crystal shape is not visible.
Formation & geological history
Forms in silica-rich hydrothermal fluids, commonly lining cavities in volcanic rocks; its age depends on the deposit and cannot be determined from the image.
Uses & applications
Used in jewelry, ornamental objects, and mineral collections.
Geological facts
Amethyst is the purple variety of quartz; heat can alter its color, sometimes producing yellow-orange citrine-like tones.
Field identification & locations
Common sources include Brazil, Uruguay, and Zambia. Identify by its quartz-like hardness and purple color; color alone is not definitive. The image shows a small polished purple stone, consistent with amethyst.
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