sedimentary

Banded sandstone pebble

Lithified quartz–feldspar sandstone, likely ferruginous and carbonaceous laminae

AI-generated identification · may be incorrect

Fine- to medium-grained, rounded, brown-gray stone with distinct dark horizontal bedding; mainly quartz and feldspar with clay, iron oxides, and dark organic or heavy-mineral layers. Hardness roughly 6–7 for quartz grains, earthy to dull luster, no obvious cleavage, and specific gravity about 2.3–2.7.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when successive sand-rich layers accumulated in a river, shoreline, or shallow-water basin, then compacted and cemented; the dark bands may reflect organic material, iron-manganese minerals, or heavier sediment. The exact geological age cannot be determined from the photograph.

Uses & applications

Primarily a natural beach/river pebble, educational specimen, or decorative stone; generally little commercial value unless sourced from a notable locality.

Geological facts

The stripes represent sedimentary bedding rather than mineral crystal banding. Weathering and abrasion have rounded the specimen and exposed the contrasting layers.

Field identification & locations

Identify by visible planar bands, granular texture, and lack of crystal faces or foliation; a hand lens should reveal sand grains. Common in sedimentary terrains, streambeds, beaches, and glacial deposits worldwide.