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510012236

Gneiss is formed from other rocks (both igneous and sedimentary) by strong heat and pressure. This piece of gneiss is made up of crystals of quartz (clear), feldspar (white) and mica (black).

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510012236.jpg
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Irish Photo Archive
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Gneiss is formed from other rocks (both igneous and sedimentary) by strong heat and pressure.  This piece of gneiss is made up of crystals of quartz (clear), feldspar (white) and mica (black).