sedimentary

Weathered sandstone or siltstone exposure

Quartz–feldspar clastic sedimentary rock; exact lithology indeterminate from the image

AI-generated identification · may be incorrect

Fine-grained, pale gray to tan, dull earthy luster, with weak bedding or weathering surfaces visible. Dominant grains are likely quartz and feldspar in a silica- or clay-rich matrix; hardness approximately 5–7 for grains, with no obvious cleavage.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand- to silt-sized sediment accumulated, was compacted, and cemented, commonly in a river, lake, beach, or shallow-marine environment. Geological age cannot be determined from the photograph.

Uses & applications

Sandstone is widely used as building stone, paving, aggregate, and a reservoir rock; attractive varieties are used decoratively. This weathered field surface has little commercial value.

Geological facts

The rounded, smooth-looking surface may be a naturally exposed bedrock layer or a partially buried cobble rather than a discrete hand specimen. Fine sediment obscures the grain size and texture.

Field identification & locations

Look for visible quartz grains, layering, gritty texture, and fizzing only if carbonate cement is present; a fresh broken surface is more diagnostic. Common worldwide, especially in sedimentary basins.