metamorphic

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss

AI-generated identification · may be incorrect

Gray and cream alternating mineral bands with dark, wavy foliation; likely quartz and feldspar with biotite or other dark mica. Quartz is Mohs 7 and feldspar about 6; gneiss has no single crystal structure or consistent cleavage. Exact composition cannot be confirmed from the photo.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when pre-existing rock is recrystallized and segregated into bands under high heat and pressure, commonly during mountain building. Gneisses range widely in age, from ancient Precambrian rocks to younger metamorphic belts.

Uses & applications

Used as dimension and landscaping stone, aggregate, and decorative building stone; attractive pieces are collected.

Geological facts

Gneissic banding reflects mineral separation during metamorphism and is not necessarily sedimentary layering.

Field identification & locations

Look for coarse, interlocking grains and distinct light–dark bands that may fold or curve; similar rocks occur in old continental shields and mountain belts worldwide. A photo alone cannot establish the precise gneiss variety.