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high magnesium fine grained igneous rock

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high magnesium fine grained igneous rock
Definition:
fine-grained igneous rock that contains unusually high concentration of MgO. For rocks that contain greater than 52 percent silica, MgO must be greater than 8 percent. For rocks containing less than 52 percent silica, MgO must be greater than 12 percent.
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komatiitic rock eu-technical Valid