mineral

Quartz-rich pebble, possibly vein quartz

Quartz (SiO₂), possibly with iron-oxide staining and minor inclusions

AI-generated identification · may be incorrect

Opaque to translucent gray-tan, with a glassy to dull luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The image shows a rounded, weathered piece among gravel; exact composition cannot be confirmed visually.

Identified September 27, 2026More mineral →

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Physical properties

Formation & geological history

Likely a fragment of quartz vein or quartz-rich rock weathered from bedrock and rounded during transport in water. Quartz veins form when silica-rich fluids fill cracks; their ages vary widely.

Uses & applications

Common quartz is used in glass, ceramics, construction aggregate, and electronics; attractive pieces may be kept as inexpensive curiosities.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, so it commonly accumulates in stream gravels.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and conchoidal or irregular fracture; quartz pebbles occur in riverbeds and many gravel deposits worldwide.