mineral

Small rounded quartz-rich pebble

Likely quartz-bearing chert or weathered quartzite; exact identification requires testing

AI-generated identification · may be incorrect

Gray-brown, opaque to weakly translucent, granular surface with dull-to-glassy luster; quartz hardness about 7 Mohs, no obvious cleavage, and high resistance to scratching. The rounded shape indicates natural abrasion or tumbling.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Probably formed from silica-rich sediment or metamorphosed sandstone, then weathered and transported in a stream or gravel deposit; its geological age cannot be determined from the photograph.

Uses & applications

Primarily a curiosity or teaching specimen; quartz-rich pebbles have limited commercial value and may be used decoratively in landscaping or crafts.

Geological facts

The image lacks scale, diagnostic crystal faces, and a fresh fracture, so distinguishing chert, quartzite, and ordinary quartz-rich rock visually is unreliable.

Field identification & locations

Common in streambeds, gravel deposits, and eroded uplands worldwide. Test with a steel file or glass (quartz-rich material should scratch glass), inspect a fresh break, and check for a waxy chert texture versus visibly interlocking quartz grains in quartzite.