sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely arkose or lithic sandstone

AI-generated identification · may be incorrect

Pale tan-gray, granular and dull-m earthy luster, with visible sand-sized grains and weak layering; quartz-rich sandstone is typically Mohs 6–7 for individual grains, but the rock is friable. Cleavage is absent; specific gravity is commonly about 2.2–2.6.

Identified September 10, 2026More sedimentary →

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Physical properties

Formation & geological history

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

Uses & applications

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

Geological facts

The rusty tan coloration commonly reflects iron-oxide cement or staining. Its rough granular texture distinguishes it from crystalline granite, marble, and most manufactured concrete.

Field identification & locations

Identify it by visible sand grains, porous texture, irregular fracture, and lack of large interlocking crystals; a diluted acid test may fizz if calcite-cemented. Sandstone occurs worldwide, especially in sedimentary basins and exposed cliffs.