sedimentary

Quartz-rich sandstone or quartzite pebble

Sandstone, likely arkosic or quartzose; possibly weakly metamorphosed quartzite

AI-generated identification · may be incorrect

Hardness approximately 6–7 Mohs; tan to gray-beige, granular, dull to slightly earthy luster, with visible sand-sized grains and subtle bedding. The rounded shape indicates water abrasion; composition is likely mainly quartz with feldspar and minor iron-oxide cement.

Identified August 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely deposited as sand in a river, beach, or shallow marine environment, then compacted and cemented over millions to hundreds of millions of years; exact age and provenance cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and decorative pieces; attractive specimens may be collected, but this pebble has little commercial value.

Geological facts

The layered bands may represent changing depositional conditions or weathering along cemented beds. If it scratches glass and shows fused grains rather than loose texture, it may instead be quartzite.

Field identification & locations

Look for gritty grains, bedding, and weak acid reaction (usually none); quartzite is harder, more massive, and scratches glass. Common worldwide in sedimentary terrains, riverbeds, beaches, and glacial deposits.