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GNEISS #4 Gneiss (folded) - Other specific examples: #1 | #2 | #3 | #4 
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Composition
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Description
Banded foliation composed of layers/zones of light colored quartz, feldspar interlayered with layers/zones of dark colored biotite and amphibole. The minerals bands in this specimen are well developed, although the folding in the rock may reduce some of the clarity of that. |
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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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