sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely ferruginous sublitharenite

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains but friable overall; pinkish-gray to tan, dull earthy luster, fine to medium granular texture, and no obvious cleavage. The rounded shape and iron-oxide staining indicate prolonged weathering and transport.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand grains—mostly quartz with feldspar or rock fragments—were compacted and cemented, commonly by silica, calcite, or iron oxides. Its exact age cannot be determined from the image; it may range from young sediment to ancient sedimentary rock.

Uses & applications

Common sandstone is used for building stone, paving, landscaping, and aggregate; attractive pieces may be collected but this specimen has little commercial value.

Geological facts

The reddish or pink coloration commonly comes from hematite or other iron oxides coating the grains. Rounding suggests abrasion in a stream, beach, or glacial environment.

Field identification & locations

Look for visible sand grains, gritty texture, sedimentary layering, and scratching by steel if quartz-rich. Common worldwide, especially in river gravels and sandstone-bearing terrains; a hand lens and dilute acid can help distinguish cement types.