sample gneiss and schist stone isolated white background metamorphic rock |
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| navigate by keyword : background big black cases crystal geology gneiss gneisses grade granite grey hard high higher macro material medium metamorphic metamorphism mineral natural nature nobody object ore pebble produced quartz rough sample schist schists single texture white |
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| Schist and gneiss are produced by medium to high grade metamorphism. In some cases gneisses are produced by higher grade metamorphism than schists. |
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