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 (gabel@oswego.edu), October 30, 2002

Answers

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 (paulhope@twcny.rr.com), October 31, 2002.