sedimentary

Weathered sandstone fragment

Quartz-rich clastic sandstone, possibly arkose or lithic sandstone

AI-generated identification · may be incorrect

Tan-gray, highly weathered, dull to weakly granular surface with visible sand-sized grains; likely Mohs hardness about 6–7 for individual quartz grains, porous, with no obvious cleavage. Exact mineralogy cannot be confirmed from the photograph alone.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was compacted and cemented by silica, calcite, or iron oxides; age is indeterminate and could range from Paleozoic to recent depending on locality. Irregular edges and surface alteration indicate natural weathering or breakage.

Uses & applications

Used as building stone, paving, aggregate, and historically as a source of silica; attractive varieties may be cut for decorative stone, but this specimen appears mainly of collecting interest.

Geological facts

Sandstone commonly preserves bedding, ripple marks, fossils, and cross-stratification, though none are clearly visible here.

Field identification & locations

Look for gritty texture, visible sand grains, porosity, and layered structure; a streak or acid test may help distinguish quartz-cemented from calcite-cemented sandstone. Common worldwide in sedimentary basins and exposed cliffs.