sedimentary

Small tan pebble, possibly chert or quartz-rich stone

Unidentified silica-rich rock; possibly microcrystalline quartz (chalcedony/chert)

AI-generated identification · may be incorrect

Small, rounded, opaque beige-brown pebble with a dull to slightly waxy surface; hardness and crystal structure cannot be confirmed from the image. If chert, it is mainly microcrystalline quartz (SiO₂), Mohs hardness about 7, with no visible cleavage.

Identified October 12, 2026More sedimentary →

Explore Small tan pebble, possibly chert or quartz-rich stone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Could have formed as silica-rich sediment or as a quartz-rich rock fragment later rounded by water or abrasion; age and exact origin cannot be determined visually.

Uses & applications

Likely of no commercial use at this size; comparable pebbles may be used in crafts or collections.

Geological facts

Its small scale, lighting, and lack of a clear view of fracture or texture prevent reliable species-level identification.

Field identification & locations

Inspect a fresh broken surface and test hardness: chert typically scratches glass and shows a waxy luster or conchoidal fracture. Silica-rich pebbles occur widely in riverbeds, beaches, and gravel deposits.