sedimentary

Quartz-rich sandstone or granitic fragment

Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Tan-gray, granular and weakly cemented, with visible pale quartz/feldspar grains and dull earthy luster; individual grains are about Mohs 6–7, while the rock may crumble or scratch easily along cemented boundaries. No obvious cleavage or crystal faces are visible.

Identified August 8, 2026More sedimentary →

Explore Quartz-rich sandstone or granitic fragment 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

Probably formed by compaction and silica or carbonate cementation of sand, commonly during shallow-marine, river, or desert deposition; its geological age cannot be determined visually. It could alternatively be a weathered igneous fragment.

Uses & applications

Typical sandstone is used for building stone, paving, aggregate, and occasionally decorative work; this small weathered fragment has negligible practical value.

Geological facts

Quartz-rich sandstone commonly shows rounded grains and sedimentary layering, whereas angular interlocking grains would favor granite or gneiss. A dilute acid test can reveal carbonate cement through fizzing.

Field identification & locations

Look for bedding, rounded grains, and a gritty texture; a glass-scratch test helps detect abundant quartz. Common worldwide in sedimentary basins and stream gravels.