sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (likely litharenite or subarkose)

AI-generated identification · may be incorrect

Tan to buff, fine- to medium-grained, dull earthy luster, with rounded water-worn shape and subtle planar fracture. Quartz-rich sandstone is typically Mohs 6–7 for individual grains but has variable overall toughness; no obvious crystal cleavage is visible.

Identified September 6, 2026More sedimentary →

Explore Rounded 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

Likely a sedimentary sandstone pebble eroded, transported, and rounded by stream or river action. The region near 38.6°N, 84.3°W commonly exposes weathered sedimentary rocks, making this identification geologically plausible; exact age cannot be determined from the photograph.

Uses & applications

Used as aggregate, building stone, paving, and landscaping material; attractive rounded pieces are collected as curios or used in crafts. This specimen has little commercial value.

Geological facts

The darker curved line may be a bedding or fracture feature rather than a fossil. A hand lens would help reveal quartz grains, feldspar, mica, or cement type.

Field identification & locations

Look for gritty sand-sized grains, poor cleavage, and resistance to scratching with a steel nail; dilute vinegar should not fizz unless carbonate cement is present. Likely sources include local stream gravels and weathered sedimentary formations of Kentucky/northern Kentucky.