gemstone
Faceted amethyst
Amethyst, purple variety of quartz (SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; purple, vitreous luster, trigonal crystal structure, and no cleavage, with conchoidal fracture. The image shows a small, step-cut faceted stone; color and quality cannot be confirmed from the photo alone.
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Physical properties
Mohs hardness 7; purple, vitreous luster, trigonal crystal structure, and no cleavage, with conchoidal fracture. The image shows a small, step-cut faceted stone; color and quality cannot be confirmed from the photo alone.
Formation & geological history
Amethyst forms when silica-rich fluids deposit quartz in cavities, commonly in volcanic rocks; much gem material formed over millions of years. Major sources include Brazil, Uruguay, Zambia, and Madagascar.
Uses & applications
Used in jewelry and as a collector’s gemstone; lower-grade material is also used for carvings and decorative objects.
Geological facts
Amethyst’s purple color is associated with trace iron and natural irradiation; heating can turn some amethyst yellow or orange, resembling citrine.
Field identification & locations
Identify by its purple color, glassy luster, and quartz hardness; a gemological test is needed to distinguish natural amethyst from synthetic or treated material. Common deposits occur in quartz-lined volcanic geodes.
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