mineral

Amethyst-bearing geode fragment

Quartz (SiO₂), with purple amethyst crystals; exact identification is uncertain from the image

AI-generated identification · may be incorrect

A small, rough, dark matrix fragment with a narrow rim of pale-purple crystals. Quartz is Mohs hardness 7, has a vitreous luster and trigonal crystal structure, and lacks cleavage; the matrix and crystal quality cannot be determined visually here.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Amethyst commonly crystallizes from silica-rich fluids in cavities in volcanic rocks, often over millions of years. The specimen’s age and precise formation setting are not discernible from the image.

Uses & applications

Amethyst is used in jewelry, carvings, and mineral collections; geode fragments are chiefly decorative or collectible.

Geological facts

Amethyst’s purple color comes from trace iron and irradiation within quartz. Its intensity can vary with heat and light exposure.

Field identification & locations

Look for quartz-like hardness, glassy luster, and purple crystal tips; confirm with a close view or hardness test, since the pictured color is subtle. Amethyst is common in Brazil, Uruguay, Zambia, and other volcanic regions.