Layered Gneiss

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Layered Gneiss

Layered Gneiss

This sample is from the Alaska Basin in Grand Teton National Park. The pink layers are highly felsic and contain large amounts of quartz and feldspar. The darker material is mafic and contains large amouns of mica, amphibole, and pyroxene.
Dan Dalton
on Nov 21, 2006 4:35 am
Image ID: 245669

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