sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, chiefly SiO₂ with variable feldspar and clay minerals

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, tan-gray color, dull to earthy luster, and granular texture; bedding or faint lamination may be visible. The specimen appears fine- to medium-grained and heavily weathered, though the image cannot confirm mineral content.

Identified August 15, 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. Its exact geological age and environment cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, aggregate, and sometimes architectural facing; ordinary fragments have negligible commercial or jewelry value.

Geological facts

Sandstone commonly preserves ripple marks, cross-bedding, mud cracks, and fossils, making it useful for reconstructing ancient rivers, deserts, beaches, and shallow seas.

Field identification & locations

Look for visible sand grains, sedimentary layering, and a gritty feel; quartz-rich pieces scratch glass and do not fizz strongly in dilute hydrochloric acid. Common worldwide, especially in former river, dune, and marine deposits.