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GNEISS #2 Garnet Gneiss - Other specific examples: #1 | #2 | #3 | #4 
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Composition
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Description
Banded foliation where the light- colored quartz and feldspar have segregated into layers from the pods/zones of dark colored amphibole and biotite. The mineral bands in this specimen are just beginning to develop, but are distinctly separate from each other putting it in the gneissic category. |
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Tectonic Association
Gneisses are typically associated with major mountain building events when shales or clay rich sandstones (wackes), or felsic igneous rocks (e.g. granite, granodiorite, etc.) are metamorphosed through depth of burial, and proximity to batholiths (click picture for larger version).
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Type of Metamorphism
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