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 Main Menu > GeoGallery > Rocks > Gneiss > Gneiss with pencil structure 
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Gneiss with pencil structure This gneiss was caught in a deep, hot part of a fault zone between rocks moving in opposite directions. The movement stretched the mineral grains into long ribbons. You can see the grains that form the ribbons by viewing the end of the rock.
Group: Metamorphic |
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