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17 November, 14:20

A geologist sends you a sample that was collected in the field. you find that it is a gray-colored igneous rock containing amphibole and intermediate plagioclase feldspar. using bowens reaction series as a guide, how would you describe its composition?

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  1. 17 November, 14:46
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    A grey coloured rock with amphibole and intermediate plagioclase like an andesine would classify as an intermediate rock by Bowen's Reaction Series and by the classification of igneous rocks would probably be like a diorite which is intermediate between a gabbro and a granite. A diorite essentially has no quartz but has the silicates amphibole (like hornblende), mica perhaps a little pyroxene and andesine plagioclase.
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