sedimentary

Reddish-brown sandstone pebble

Quartz-rich sandstone, commonly ferruginous sandstone (SiO₂-dominated)

AI-generated identification · may be incorrect

Fine-grained, matte to earthy luster, rounded and naturally smoothed; typically Mohs hardness 6–7 for quartz grains, with variable porosity and no visible cleavage. The orange-brown color indicates iron-oxide staining, and the surface texture may reflect weathering or abrasion.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized mineral grains, mainly quartz, were compacted and cemented; iron oxides commonly provide the coloration. The specimen’s exact geological age cannot be determined from the photograph; it may derive from a sedimentary formation or weathered sandstone bedrock.

Uses & applications

Used as aggregate, building stone, landscaping material, and occasionally decorative tumbled stone; this ordinary pebble has little jewelry or commercial value.

Geological facts

Sandstone color can change substantially with hematite or limonite cement. Rounded edges and a uniformly smoothed surface suggest transport by a stream, beach, or glacial environment.

Field identification & locations

Identify by gritty grain texture, visible sand-sized particles, earthy orange-red color, and lack of crystalline sparkle; a streak, acid, and grain inspection would help distinguish it from brick or ceramic. Common worldwide, especially in sedimentary basins and river or beach gravels.