gemstone

Amethyst (small rough crystal)

Quartz, SiO₂; purple color from trace iron and natural irradiation

AI-generated identification · may be incorrect

Likely a small purple quartz fragment with vitreous luster and no visible cleavage; quartz has Mohs hardness 7, specific gravity about 2.65, and trigonal crystal structure. The image is dim, so identification is tentative.

Identified October 4, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms in silica-rich fluids, commonly lining cavities in volcanic rocks; deposits range from ancient to geologically recent. Its purple color develops through iron impurities and radiation exposure.

Uses & applications

Used in jewelry, carvings, ornamental objects, and mineral collections.

Geological facts

Amethyst is the purple variety of quartz; its color can fade with prolonged sunlight or heat.

Field identification & locations

Look for purple coloration, glassy luster, and hardness sufficient to scratch glass; common sources include Brazil, Uruguay, and Zambia. The image does not show enough detail for confirmation.