mineral

Rounded quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly chert or chalcedony

AI-generated identification · may be incorrect

Smooth, water-worn, opaque tan-brown pebble with a dull to weakly waxy luster; quartz hardness about 7 Mohs, no obvious cleavage, and specific gravity near 2.6. Internal color variation may reflect iron-oxide staining or fine inclusions.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Probably formed as a silica-rich rock or nodule and rounded by stream, beach, or glacial transport; its exact geological age cannot be determined from the photograph. Common source rocks include chert, quartzite, and chalcedony-bearing volcanic or sedimentary formations.

Uses & applications

Suitable as a decorative pebble, craft material, or lapidary stone; if it proves to be attractive chalcedony, it may be polished for jewelry or display. This specimen has little commercial value based on appearance alone.

Geological facts

The image does not show diagnostic banding, translucency, crystal faces, or texture clearly enough for a precise identification. A steel file or glass-scratch test can help distinguish quartz-rich material, though testing may mark the specimen.

Field identification & locations

Common in gravel beds, river margins, beaches, glacial deposits, and weathered outcrops worldwide; inspect a freshly broken or polished surface for quartz texture and test for acid reaction to exclude carbonate rock. Estimated value: $1–$10 as a common pebble, or roughly $10–$30 if confirmed attractive lapidary chalcedony.