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GeoRef Subject
Canadian Shield Canada garnet group chain silicates rutile metamorphism metamorphic rocks silicates gneisses kyanite muscovite oxides sheet silicates mica group mylonites orthosilicates upper Precambrian crust Archean feldspar group Athabasca Formation Proterozoic zircon crystal structure Precambrian pyroxene group framework silicates clinopyroxene zircon group nesosilicates North America Western Canada
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