metamorphic

Banded gneiss

Foliated quartz–feldspar gneiss, likely with mica

AI-generated identification · may be incorrect

Gray, cream, and brown mineral bands with a coarse, foliated texture. Likely composed mainly of quartz and feldspar with dark mica; quartz hardness is 7 and feldspar about 6 Mohs. The small specimen’s minerals and cleavage are not reliably determined from the photo.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Gneiss forms when pre-existing rock is recrystallized and segregated into bands under high temperature and pressure. It can form in ancient continental crust; this specimen’s age and precise origin cannot be determined visually.

Uses & applications

Gneiss is used as dimension stone, paving, aggregate, and decorative stone; this small piece is mainly suitable for collecting.

Geological facts

Its alternating light and dark streaks are characteristic gneissic banding, produced by mineral segregation during metamorphism.

Field identification & locations

Look for coarse, interleaved light and dark bands rather than the thin, planar layers of schist. Gneiss occurs in metamorphic terrains worldwide; a photo alone cannot establish the exact rock type or locality.