sedimentary

Weathered sandstone

Quartz-rich sandstone (clastic sedimentary rock)

AI-generated identification · may be incorrect

Typically composed of sand-sized quartz with feldspar, rock fragments, and iron-oxide cement; Mohs hardness about 6–7 for grains, generally tan to brown, dull to earthy luster, porous, and non-cleavable. The specimen appears medium- to coarse-grained and strongly weathered.

Identified September 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when deposited sand was compacted and cemented, commonly in rivers, dunes, beaches, or shallow marine settings; its exact geological age cannot be determined from the photograph. Brown coloration likely reflects oxidized iron minerals.

Uses & applications

Used as building stone, paving, wall stone, aggregate, and historically as a source of silica; attractive varieties may be used ornamentally, but this specimen appears ordinary.

Geological facts

Sandstone often preserves cross-bedding, ripple marks, fossils, or rounded grains that reveal its depositional environment. Weathering preferentially removes cement, producing its rough, friable surface.

Field identification & locations

Identify it by visible sand grains, gritty texture, pores, and layers; a steel nail generally scratches the cemented rock but not individual quartz grains. Common worldwide, especially in sedimentary basins and desert or coastal regions.