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what would you name a fine-grained igneous rock composed of 60% ca-rich plagioclase feldspar, 30% pyroxene, and 10% amphibole?
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what would you name a fine-grained igneous rock composed of 60% ca-rich plagioclase feldspar, 30% pyroxene, and 10% amphibole?

User Jakub Marchwicki
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Gabbro
Gabbro is a mafic, intrusive medium to coarse-grained igneous rock with a phaneritic texture. Gabbro is composed primarily of pyroxene, with calcium-rich plagioclase feldspar and small amounts of olivine and amphibole.
User Shoval Sadde
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