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gabbro




gabbro
Gabbro. Credit: Mineral Information Institute
A dense, dark, course-grained igneous rock consisting largely of plagioclase feldspar, pyroxene, and olivine. Gabbro is the intrusive (i.e., cooled and solidified underground) equivalent of basalt. Accessory minerals in gabbros include apatite, hornblende, ilmenite, and magnetite.

A gabbro containing nickel at Sudbury in Canada is one of the richest sources known of that metal.


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   • GEOLOGY AND PLANETARY SCIENCE