mineral

Quartz geode nodule (possibly chalcedony)

Silica, SiO₂; quartz or microcrystalline quartz (chalcedony)

AI-generated identification · may be incorrect

A rounded, cream-white, apparently smooth nodule with faint cracks; the image does not show a crystal interior, so identification is uncertain. Quartz has Mohs hardness 7, vitreous luster when crystalline, and no cleavage; chalcedony is waxy to dull and microcrystalline.

Identified September 23, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids can deposit quartz or chalcedony in cavities and fractures, sometimes forming geodes or nodules. Such material occurs in rocks of many ages; age and formation setting cannot be determined from this image.

Uses & applications

Quartz is used in glass, electronics, and construction; attractive geodes and polished nodules are collected or used decoratively.

Geological facts

A geode has a hollow interior lined with crystals, but the specimen shown appears unbroken, so a geode cannot be confirmed.

Field identification & locations

Look for hardness sufficient to scratch glass and, on a broken surface, glassy quartz crystals or waxy chalcedony. Silica nodules occur worldwide; the image alone does not support a more specific locality or identification.