mineral

White quartz geode

Quartz geode; predominantly microcrystalline and drusy SiO₂

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to colorless, vitreous to sugary luster, with fine quartz crystals lining a hollow cavity. Quartz is trigonal and has no cleavage, showing conchoidal fracture; specific gravity is about 2.65.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits quartz crystals inside gas vesicles, cavities, or voids in volcanic rock, commonly basalt. The specimen’s exact geological age cannot be determined from the image; geodes range from Paleozoic to recent formations.

Uses & applications

Used as a decorative, lapidary, and mineral-collecting specimen; attractive crystal-lined interiors may be mounted or polished. Ordinary white geodes have modest commercial value.

Geological facts

The sparkling interior is drusy quartz, composed of many tiny interlocking crystals. Gray or brown areas may represent chalcedony, iron oxides, or residual host rock.

Field identification & locations

Identify by its hollow cavity, rounded nodule shape, and hard glassy quartz crystals that resist scratching by steel. Common sources include Brazil, Uruguay, Mexico, Morocco, and the United States, especially Iowa, Indiana, and Arizona.