sedimentary

Water-worn sandstone pebble

Quartz-rich sandstone (composition and exact subtype uncertain from image)

AI-generated identification · may be incorrect

Fine-grained, rounded, tan-gray pebble with a dull, granular surface; likely mostly quartz with possible feldspar and rock fragments. Quartz hardness is 7 Mohs; sandstone hardness varies with its cement and grains, and no crystal cleavage is visible.

Identified October 12, 2026More sedimentary →

Explore Water-worn sandstone pebble 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

Sand grains were deposited, compacted, and cemented into sandstone, then weathered and rounded by flowing water or wave action. Its geological age and original source cannot be determined from appearance alone.

Uses & applications

Commonly used as decorative aggregate, landscaping stone, and building stone; this small pebble is mainly suitable for collecting or crafts.

Geological facts

Sandstone is a clastic sedimentary rock, and its grain size and cement determine its durability and texture.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; rounded edges suggest transport by water. Sandstone occurs worldwide in sedimentary basins and river or beach gravels.