sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, primarily SiO₂ with clay/mineral cement

AI-generated identification · may be incorrect

Tan, fine- to medium-grained, dull earthy luster, and visibly friable; likely hardness around 6–7 for quartz grains but weak overall due to cement. No obvious crystals or cleavage; granular texture and dusty weathering are characteristic.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a sedimentary basin, commonly by silica, calcite, or iron oxides. The specimen’s exact geological age cannot be determined from the image; sandstone ranges from Precambrian to modern.

Uses & applications

Used as building stone, paving, aggregate, and historically for carving; attractive varieties are used decoratively. This small, weathered fragment has negligible commercial value.

Geological facts

Sandstone commonly preserves ripple marks, cross-bedding, fossils, and ancient desert, river, beach, or dune environments. Its color reflects cement and impurities, especially iron oxides for reddish tones.

Field identification & locations

Identify it by its sand-sized grains, gritty feel, layered or porous texture, and tendency to shed particles; a hand lens and acid test can distinguish carbonate cement. Common worldwide, especially in sedimentary basins and exposed cliffs.