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5 February, 21:55

Which is a fine-grained igneous rock made up primarily of pyroxene and plagioclase feldspar?

a. granite

b. gabbro

c. basalt

d. rhyolite

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  1. 5 February, 22:06
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    A. Basalt

    Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene. The specimen shown is about two inches (five centimeters) across. Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende, and sometimes quartz.
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