sedimentary

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

AI-generated identification · may be incorrect

Fine-grained, tan sandstone with parallel dark gray to black laminae, matte to slightly sandy luster, and no visible crystals or cleavage. Quartz-rich sandstone typically has Mohs hardness about 6–7, though cement and grains may vary; its rounded shape indicates abrasion or tumbling.

Identified August 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated in beds and lithified by compaction and cementation, with darker layers reflecting changes in sediment composition or organic/mineral content. Its age cannot be determined from the photograph; sandstone ranges from Precambrian to modern geological settings.

Uses & applications

Primarily a collectible or lapidary specimen; sandstone is widely used as building stone, paving, aggregate, and abrasive material, but this small piece has little industrial value.

Geological facts

The regular striping resembles sedimentary bedding, although some metamorphic rocks can show similar banding. A glass-scratch test, acid test, and thin-section examination would improve identification.

Field identification & locations

Common in eroded sedimentary terrains and river or beach gravels. Look for granular texture, bedding, and grains that may abrade glass; avoid calling it a mineral because it is a rock composed of several minerals.