gemstone
Tumbled amethyst chips
Amethyst, purple variety of quartz (SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; translucent purple to reddish-violet, vitreous luster, trigonal crystal structure, and no true cleavage. The pieces appear small and tumbled or polished; color varies naturally in quartz.
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Physical properties
Mohs hardness 7; translucent purple to reddish-violet, vitreous luster, trigonal crystal structure, and no true cleavage. The pieces appear small and tumbled or polished; color varies naturally in quartz.
Formation & geological history
Amethyst forms when silica-rich fluids deposit quartz in cavities, commonly in volcanic rocks; its purple color comes from trace iron and natural irradiation. Deposits range from ancient to geologically recent, depending on the host rock.
Uses & applications
Used in inexpensive jewelry, beadwork, crafts, and mineral collections. These chips may be strung as a bracelet or necklace.
Geological facts
Amethyst is quartz colored by iron-related defects; heating can turn some material yellow or orange, resembling citrine.
Field identification & locations
Identify it by its purple color, glassy luster, hardness, and lack of cleavage; common sources include Brazil, Uruguay, Zambia, and Madagascar. The photo supports amethyst, though color alone cannot rule out other purple stones.
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