mineral
Likely rough amethyst
Quartz, SiO₂; purple variety colored mainly by iron impurities
AI-generated identification · may be incorrectPurple, translucent to transparent with vitreous luster and irregular fractured surfaces; trigonal crystal structure, Mohs hardness 7, no cleavage. The image is too limited to confirm the identification or assess treatment.
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Physical properties
Purple, translucent to transparent with vitreous luster and irregular fractured surfaces; trigonal crystal structure, Mohs hardness 7, no cleavage. The image is too limited to confirm the identification or assess treatment.
Formation & geological history
Forms when silica-rich fluids deposit quartz in cavities and veins, commonly in volcanic rocks; specimens range from recent to hundreds of millions of years old.
Uses & applications
Used for jewelry, carvings, decorative objects, and mineral collecting.
Geological facts
Amethyst’s purple color is associated with iron impurities and natural irradiation; heating can turn some amethyst yellow or orange.
Field identification & locations
Look for purple quartz, hardness near 7, and conchoidal fracture; major sources include Brazil, Uruguay, Zambia, and Madagascar. A photo alone cannot establish locality or authenticity.
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