gemstone

Polished amethyst or quartz chip

Quartz, silicon dioxide (SiO₂), likely purple amethyst with possible iron-oxide inclusions

AI-generated identification · may be incorrect

A small polished, pale purple-to-white translucent fragment with vitreous luster; quartz hardness is 7, has no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The image is insufficient to confirm amethyst versus dyed or included quartz.

Identified August 19, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms when iron-bearing silica-rich fluids fill cavities in volcanic rocks, especially basaltic geodes; coloration develops through irradiation and trace iron. Deposits commonly range from Paleozoic to Cenozoic in age.

Uses & applications

Used for cabochons, beads, carvings, decorative objects, and mineral collections; this small polished piece has limited gem value.

Geological facts

Amethyst is the purple variety of quartz, and its color may fade with prolonged heating or intense sunlight. Pale areas commonly reflect low iron content, zoning, or surface polishing.

Field identification & locations

Look for natural purple zoning, quartz-like hardness, glassy luster, and conchoidal fracture; a scratch test, loupe examination, and inspection for dye concentration in cracks can help distinguish treated material. Common sources include Brazil, Uruguay, Zambia, and Bolivia.