Gneiss

Gneiss
Wikimedia Commons

Gneiss

Metamorphic

Hardness: ≈6–7 Approximate

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MarbleQuartziteSchistSlateSoapstoneUnakite

Gneiss is a high‑grade metamorphic rock with light‑and‑dark compositional banding formed when pre‑existing rocks recrystallize under intense heat and pressure.

Parent: Metamorphic Rocks

Related: Granite, Epidote

Related: Marble, Quartzite, Schist, Slate

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