sedimentary

Small brown pebble (likely iron-stained quartz or chert)

Undetermined silicate pebble; possible quartz (SiO₂) or chert (microcrystalline SiO₂)

AI-generated identification · may be incorrect

Small, rounded, opaque brown specimen with a dull to slightly waxy luster; hardness and cleavage cannot be determined from the photo. Quartz is Mohs 7; chert is about 6.5–7, both with no cleavage.

Identified September 27, 2026More sedimentary →

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Physical properties

Small, rounded, opaque brown specimen with a dull to slightly waxy luster; hardness and cleavage cannot be determined from the photo. Quartz is Mohs 7; chert is about 6.5–7, both with no cleavage.

Formation & geological history

Likely weathered from a larger silicate rock and rounded by water or abrasion; its age and exact source cannot be determined visually.

Uses & applications

This pebble is mainly suitable for collecting or crafts; quartz and chert varieties have broader uses in glass, tools, and decorative materials.

Geological facts

Iron-oxide staining commonly gives quartz-rich pebbles brown colors. A photo alone cannot reliably distinguish quartz, chert, or other brown minerals.

Field identification & locations

Look for hardness (whether it scratches glass), a glassy or waxy fracture, and any visible grains; common pebbles occur in stream beds, beaches, and gravel. A close-up and simple hardness/streak tests would help identification.