mineral
Druzy agate/geode fragment
Chalcedony (microcrystalline SiO₂) with a druzy quartz center
AI-generated identification · may be incorrectGray-white, waxy to vitreous banded chalcedony surrounding a sparkly tan quartz-crystal cavity; quartz hardness 7 Mohs, trigonal crystal structure, no prominent cleavage. Specific gravity is about 2.6.
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Physical properties
Gray-white, waxy to vitreous banded chalcedony surrounding a sparkly tan quartz-crystal cavity; quartz hardness 7 Mohs, trigonal crystal structure, no prominent cleavage. Specific gravity is about 2.6.
Formation & geological history
Silica-rich fluids filled cavities in volcanic rock; later quartz crystals grew inward, with iron oxides likely coloring the druzy. Such geodes form across many geological ages.
Uses & applications
Polished pieces are used for jewelry, ornaments, and collecting; agate is also used for carvings and decorative objects.
Geological facts
The central glittering surface is a druzy—a coating of tiny quartz crystals—while the rippled outer bands are chalcedony.
Field identification & locations
Look for curved, concentric bands and a crystalline cavity; common sources include Brazil, Uruguay, and the western United States. The image shows a small, likely cut or broken specimen.
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