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Gneiss boulders

Gneiss boulders

E417/0208

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Credit

DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY

Caption

Gneiss boulders in a river. Gneiss is formed from other types of rock that are subjected to intense heat or pressure (metamorphism). These extreme forces, typically found in the roots of mountains, obliterate the rock's original structure and cause minerals to recrystallize in bands. In gneiss, the bands are coarse-grained and consist of three minerals: mica (dark bands) alternating with a mixture of quartz and feldspar (light bands). Photographed in the Maggia Valley, Ponte Brolla, Switzerland.

Release details

Model release not required. Property release not required.

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