metamorphic

Banded dark pebble (likely gneiss or banded metamorphic rock)

Indeterminate from the image; possibly banded gneiss

AI-generated identification · may be incorrect

Small, rounded, dark-gray pebble with a narrow tan band. Grain size and mineral luster are not clear enough to determine hardness, cleavage, or specific gravity; gneiss typically has Mohs hardness 6–7 and a foliated, granular texture.

Identified September 25, 2026More metamorphic →

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Physical properties

Formation & geological history

If gneiss, it formed through high-grade metamorphism of older igneous or sedimentary rock; its age and exact origin cannot be established from appearance alone.

Uses & applications

Likely a natural beach or river pebble, suitable for collecting or decoration; no distinctive commercial use is identifiable.

Geological facts

The pale stripe may be a mineral-rich band or vein, but a photograph cannot confirm its composition.

Field identification & locations

Rounded shape suggests abrasion during transport by water or ice. A fresh surface and close inspection of grain size and banding would help distinguish gneiss from other dark rocks.