metamorphic

Banded gneiss

Foliated, banded gneiss; typically composed of quartz and feldspar with mica or other dark minerals

AI-generated identification · may be incorrect

Visible alternating light and dark mineral bands, with a coarse crystalline texture and uneven fracture. Typical Mohs hardness is about 6–7; exact composition and properties cannot be confirmed from the photo.

Identified September 24, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when pre-existing igneous or sedimentary rock is recrystallized and segregated into mineral bands under high heat and pressure, commonly during mountain-building. Gneisses occur in ancient continental crust, often billions of years old.

Uses & applications

Used as dimension stone, paving, landscaping aggregate, and decorative facing; attractive banded pieces may be collected.

Geological facts

The specimen’s contrasting bands are characteristic of gneissic foliation, but the image alone cannot establish its precise mineral composition or geological age.

Field identification & locations

Look for coarse, interlocking crystals arranged in alternating light and dark layers; gneiss is common in exposed continental shields and mountain belts. A closer view or simple mineral tests would help distinguish it from banded granite or other foliated rocks.