sedimentary

Weathered graywacke or sandstone fragment

Lithic sandstone, likely quartz–feldspar–rock-fragment aggregate

AI-generated identification · may be incorrect

Fine- to medium-grained, dull earthy luster, gray-beige color, and irregular fracture with possible weak bedding; estimated hardness about 5–7 Mohs and specific gravity roughly 2.5–2.7. The image is insufficient to determine exact grain size or mineral content.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely consolidated sand deposited in a river, beach, or submarine setting, then buried and lithified by compaction and cementation; age cannot be determined visually. Surface rounding indicates transport or weathering.

Uses & applications

Common sandstone is used as aggregate, fill, building stone, and occasionally decorative material; this small fragment has negligible commercial value.

Geological facts

The specimen appears sedimentary rather than crystalline, with a weathered outer surface and a darker freshly broken edge. Similar-looking fragments can also be altered volcanic rock, so a hand lens and fresh surface are useful.

Field identification & locations

Look for visible sand grains, bedding, and a gritty texture; sandstone scratches glass variably depending on quartz content. Common worldwide, especially in sedimentary basins.