sedimentary

Likely sandstone

Quartz-rich sandstone, probably arkosic or lithic sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, dull tan-gray, and weakly consolidated; likely quartz with feldspar and rock fragments in a cementing matrix. Mohs hardness is roughly 6–7 for grains, with earthy luster and no obvious cleavage; exact texture is obscured by dim lighting.

Identified August 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented in a river, dune, beach, or shallow-marine setting. Its age cannot be determined from the photograph and may range from Precambrian to recent geological formations.

Uses & applications

Used as building stone, paving, aggregate, and a source of silica; attractive varieties are used decoratively. This ordinary fragment has minimal commercial or collector value.

Geological facts

Sandstone commonly preserves ripple marks, cross-bedding, burrows, and fossils. Iron-oxide cement often produces red or brown coloration, while this specimen appears relatively weakly colored.

Field identification & locations

Look for visible sand grains, gritty texture, bedding, and a granular fracture; a streak or acid test can help distinguish it from limestone, while a hand lens improves identification. Common worldwide, especially in sedimentary basins.