mineral

Quartz geode

Microcrystalline quartz and crystalline quartz (SiO₂), likely in a weathered volcanic or sedimentary host

AI-generated identification · may be incorrect

White to translucent gray quartz lining a hollow cavity, with drusy crystals and iron-oxide yellow-brown staining; Mohs hardness 7, vitreous to dull luster, no cleavage, conchoidal fracture, specific gravity about 2.65.

Identified September 10, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater deposited quartz in a gas cavity or dissolution void, commonly over millions of years during burial and weathering; the exact age and host rock cannot be determined from the image.

Uses & applications

Used as a decorative specimen, lapidary material, and educational example; attractive geodes may be cut, polished, or displayed, but this specimen appears modestly collectible.

Geological facts

The cavity and crystal lining identify it as a geode rather than solid quartz. The white coating may include chalcedony, while yellow-brown areas are probably limonite or iron oxides.

Field identification & locations

Identify by the hollow interior, concentric rind, and inward-pointing quartz crystals; common sources include Brazil, Uruguay, Mexico, Morocco, and the western United States. Confirm quartz with a glass-scratching test, while avoiding damage to valuable specimens.