metamorphic

Layered metamorphic rock, possibly banded gneiss

Gneiss (tentative; exact identification requires closer examination)

AI-generated identification · may be incorrect

Small, weathered tan-brown specimen with distinct pale and dark wavy layers and a rough, granular surface. If gneiss, it is typically composed of quartz, feldspar, and mica, with Mohs hardness around 6–7; crystal structure and specific gravity cannot be determined from the image.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Gneiss forms when pre-existing rock is recrystallized and compositionally banded under high heat and pressure, commonly deep in continental crust; its age cannot be inferred from appearance.

Uses & applications

Gneiss is used as dimension stone, paving, aggregate, and a collectible field specimen.

Geological facts

Its alternating mineral-rich bands are called gneissic banding and reflect mineral segregation during metamorphism.

Field identification & locations

The visible layering supports a banded rock identification, but the specimen is too small and image detail too limited to distinguish gneiss confidently from other layered rocks. Gneiss occurs widely in ancient continental basement and mountain belts; examine a fresh surface and grain texture for confirmation.