sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely feldspathic or lithic sandstone

AI-generated identification · may be incorrect

Light tan-gray, rough and granular with visible sand-sized grains and brown weathering; likely Mohs hardness ~6–7 overall, dull to slightly earthy luster, and no obvious cleavage. Individual quartz grains are hard, while the cement may be weaker.

Identified August 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented by silica, iron oxides, or carbonate, commonly in rivers, dunes, beaches, or shallow marine settings. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, aggregate, and occasionally as a decorative stone; this small weathered fragment has negligible commercial or jewelry value.

Geological facts

Sandstone commonly preserves cross-bedding, ripple marks, fossils, and ancient environmental clues. Brown or reddish tones often reflect iron-oxide cement or weathering.

Field identification & locations

Identify it by its gritty texture and visible clastic grains; a steel nail may scratch weakly cemented sandstone, while quartz grains resist scratching. Common worldwide, especially in sedimentary basins and exposed cliffs.