mineral

Quartz geode fragment

Mostly crystalline quartz (SiO₂), likely with chalcedony and minor iron-oxide staining

AI-generated identification · may be incorrect

White to tan, translucent-to-opaque crystals with a vitreous luster and uneven fracture; quartz hardness is 7 Mohs and its crystal system is trigonal. The cavity has a drusy lining; the image does not show enough detail to identify minor minerals confidently.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids deposited quartz crystals inside a cavity in volcanic rock or sediment. The specimen’s age and exact geological setting cannot be determined from the image.

Uses & applications

Small fragments are mainly collected or used in craft and decorative settings; quartz also has broad industrial uses in glass and electronics.

Geological facts

The crystal-lined hollow is a geode-like vug, formed as minerals crystallized inward from its walls.

Field identification & locations

Look for a hollow or former cavity with closely packed, glassy quartz crystals; common geodes occur in volcanic and sedimentary regions worldwide. A photo alone cannot confirm the host rock or locality.