gemstone
Amethyst (faceted gemstone)
Quartz, SiO₂; purple coloration from trace iron and irradiation
AI-generated identification · may be incorrectMohs hardness 7; purple, vitreous luster, trigonal crystal structure, and no true cleavage. This image shows a faceted cut stone; its size and quality cannot be reliably determined from the photo.
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Physical properties
Mohs hardness 7; purple, vitreous luster, trigonal crystal structure, and no true cleavage. This image shows a faceted cut stone; its size and quality cannot be reliably determined from the photo.
Formation & geological history
Forms in silica-rich hydrothermal veins and cavities in volcanic rocks, often as crystals lining geodes. Deposits occur across a range of geological ages, commonly in basalt-hosted cavities.
Uses & applications
Used in jewelry, ornamental objects, and mineral collections; lower-grade material is also used for carvings and décor.
Geological facts
Amethyst is the purple variety of quartz; heating can produce yellow or orange citrine-like colors. Its color may fade with prolonged intense sunlight.
Field identification & locations
Identify by its purple color, glassy luster, hardness, and quartz-like properties; common sources include Brazil, Uruguay, Zambia, and Madagascar. A gemological test is needed to distinguish natural amethyst from some imitations.
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