mineral

Quartz geode fragment

Quartz (SiO₂), likely a small drusy quartz-lined cavity in silica-rich host rock

AI-generated identification · may be incorrect

White to translucent, glassy-to-dull quartz crystals on a rough, porous matrix; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The visible cavity and crystalline lining are consistent with a geode fragment, though the image alone cannot confirm the host rock or exact mineral mix.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Geodes form as mineral-rich fluids deposit silica in cavities over time; the specimen’s geological age and precise formation environment cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, and ornamental objects; geode fragments are mainly collected or used decoratively.

Geological facts

Quartz is one of Earth’s most abundant minerals and occurs in many colors and forms.

Field identification & locations

Look for a rounded or hollow interior lined with tiny crystals and a contrasting outer rind; geodes occur worldwide, including in volcanic and sedimentary terrains. A small, common fragment of this size is typically worth about $1–$10 USD.