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Help identifying
- Thread starter Deannachunn
- Start date
Geologyhound
Well-known member
A gneiss is a metamorphic rock where the original minerals have been subjected to enough temperature and pressure that they have re-crystallized to a different mineral. The color banding in your rocks is a good indicator. The presence of sheet silicates would indicate a lower metamorphic grade. The sheet silicates tend to disappear as a rock undergoes more metamorphism.