mineral

Amethyst druzy geode

Quartz, SiO₂, purple variety (amethyst)

AI-generated identification · may be incorrect

Hardness 7 Mohs; purple to violet color with glittering vitreous druzy crystals, typically trigonal quartz structure and indistinct cleavage. The rough gray-brown host is likely quartz-rich volcanic or sedimentary matrix; color comes mainly from iron impurities and irradiation.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits quartz crystals in cavities, commonly in basaltic lava flows; amethyst growth is generally Cenozoic to Mesozoic, depending on locality. The specimen appears cut or broken to expose a druzy-lined cavity.

Uses & applications

Used for mineral collecting, ornaments, cabochons, and jewelry; larger geodes are decorative objects. Common specimens have modest commercial value.

Geological facts

Druzy means a coating of many tiny crystals rather than one large crystal. Heating can turn some amethyst yellow-orange, producing citrine-like material.

Field identification & locations

Identify it by the purple hue, sparkling quartz surface, glassy luster, and hardness sufficient to scratch ordinary glass; it should not fizz in dilute acid. Major sources include Brazil, Uruguay, Mexico, Zambia, and the United States.