sedimentary

Weathered sandstone

Quartz-rich clastic sandstone, chiefly SiO₂ with minor feldspar, lithic grains, and iron-oxide/clay cement

AI-generated identification · may be incorrect

Light gray-beige, fine- to medium-grained, dull earthy luster, and likely weakly cemented; quartz hardness is 7 Mohs, though the whole rock may crumble. Bedding is not clearly visible, and the dark yellow-green coating is likely lichen or weathering residue.

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, beach, dune, or shallow-marine environment; its exact geological age cannot be determined from the image. Surface oxidation, moisture, and biological growth produced the weathered appearance.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally carving material; this ordinary weathered piece has little jewelry value.

Geological facts

Sandstone’s visible grains and gritty texture distinguish it from homogeneous igneous rocks. The specimen may also be a weathered sandy sedimentary rock or artificially placed landscaping stone.

Field identification & locations

Identify it by a gritty granular surface, sand-sized particles, and scratching glass only if quartz-rich; dilute acid normally causes no reaction unless carbonate cement is present. Sandstones occur worldwide, especially in sedimentary basins.