gemstone

Amethyst

Purple variety of quartz; silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Likely a small polished or cut purple quartz specimen. Mohs hardness 7; vitreous luster and trigonal crystal structure, with no cleavage and uneven to conchoidal fracture. The image is too out of focus to assess clarity or cut precisely.

Identified October 5, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms when iron-bearing quartz crystallizes in silica-rich fluids, commonly lining cavities in volcanic rock. Deposits range from ancient to geologically recent; age cannot be determined from the image.

Uses & applications

Used in jewelry, ornamental objects, and mineral collections.

Geological facts

Its purple color is associated with trace iron and natural irradiation; heating can turn some amethyst yellow or orange, resembling citrine.

Field identification & locations

Common sources include Brazil, Uruguay, Zambia, and Madagascar. Identify by its purple color, glassy luster, and hardness; the blurred image does not allow reliable confirmation beyond appearance.