mineral
Amethyst chip or tumbled fragment
Quartz, SiO₂; purple coloration from trace iron and irradiation
AI-generated identification · may be incorrectAppears translucent purple with a vitreous luster, though the blurry image prevents confident assessment of crystal form or cleavage. Quartz has Mohs hardness 7, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65.
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Physical properties
Appears translucent purple with a vitreous luster, though the blurry image prevents confident assessment of crystal form or cleavage. Quartz has Mohs hardness 7, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65.
Formation & geological history
Amethyst forms when iron-bearing silica-rich fluids fill cavities in volcanic rocks, commonly alongside agate; most deposits are Cenozoic to Precambrian in age. The specimen may be a small polished or naturally broken piece.
Uses & applications
Used as a gemstone, ornamental material, and mineral-collection specimen; small chips have modest decorative value.
Geological facts
Amethyst is the purple variety of quartz and is February’s birthstone. Heating can change its color to yellow or orange citrine-like tones.
Field identification & locations
Identify by purple color, glassy luster, hardness sufficient to scratch glass, and lack of obvious cleavage; common sources include Brazil, Uruguay, Zambia, and Mexico. The image is too indistinct to exclude purple glass or another violet mineral.
