The type of composition that igneous rocks have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals would be andesitic. I am hoping that this answer has satisfied your query about and it will be able to help you.
An igneous rock that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals has a composition that is andesitic. :)
Answer:
b.
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