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basalt rock composition

Basalt Rock Composition

Basalt is the most common rock on Earths surface Specimens are black in color and weather to dark green or brown Basalt is rich in iron and magnesium and is mainly composed of olivine pyroxene and plagioclase Most specimens are compact finegrained and glassy They can also be porphyritic with phenocrysts of olivine augite or plagioclase

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