Question about igneous rocks : LUSENET : Introductory Geology, Oswego State : One Thread

What is the name for an igneous rock that is coarse-grained, dark gray in color, and contains mostly Ca-rich plagioclase and a lot of ferromagnesian silicates too?

-- Sharon Gabel (, October 30, 2002


Well sharon, Gabbro consists of lots of feldspares and mafics and is Calcium rich. If it was fine grain it would be basalt and a bit darker.

-- Paul Roddy (, October 31, 2002.

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