mineral
Likely rough amethyst (purple quartz)
Quartz, SiO₂; purple coloration typically caused by trace iron and natural irradiation
AI-generated identification · may be incorrectAppears dark purple and translucent with a vitreous luster; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage and conchoidal fracture. The small, partly obscured specimen cannot be identified conclusively from the image.
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Physical properties
Appears dark purple and translucent with a vitreous luster; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage and conchoidal fracture. The small, partly obscured specimen cannot be identified conclusively from the image.
Formation & geological history
Amethyst commonly crystallizes from silica-rich fluids in cavities and veins, often within volcanic rocks; its age depends on the host deposit and may range from millions to billions of years.
Uses & applications
Used for jewelry, carvings, and mineral collecting.
Geological facts
Amethyst is the purple variety of quartz; heating can turn some material yellow or greenish.
Field identification & locations
Check for purple color within quartz-like material, glassy luster, and hardness sufficient to scratch ordinary glass; common sources include Brazil, Uruguay, Zambia, and Madagascar.
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