mineral

Quartz geode

Mostly crystalline quartz (SiO₂), likely a small quartz-lined geode; exact host rock is unclear from the photo.

AI-generated identification · may be incorrect

White to colorless, glassy-to-sparkling crystals lining a cavity in a pale, rough outer matrix. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65.

Identified October 10, 2026More mineral →

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Physical properties

White to colorless, glassy-to-sparkling crystals lining a cavity in a pale, rough outer matrix. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65.

Formation & geological history

Mineral-rich water deposited silica inside a cavity in host rock, where quartz crystals grew over time. Geodes form in varied settings and ages; this specimen’s specific age and origin cannot be determined visually.

Uses & applications

Commonly collected and displayed; larger geodes may be cut for décor, while quartz is also used in glassmaking, electronics, and abrasives.

Geological facts

The hollow, crystal-lined interior is characteristic of a geode, though this piece appears opened or broken rather than intact.

Field identification & locations

Look for a cavity lined with inward-pointing crystals and a contrasting outer rind; quartz is widespread worldwide. The photo does not show enough matrix to identify the locality or host rock.