troctolite

A Dictionary of Earth Sciences | 1999 | 317 words | Copyright

troctolite A coarse-grained, igneous rock consisting of essential magnesium-rich olivine and calcium-rich plagioclase feldspar with accessory ilmenite; i.e. it is gabbro without the pyroxene component. Troctolites grade into gabbros by a gradual increase in pyroxene content and a gradual decrease in olivine content.

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AILSA ALLABY and MICHAEL ALLABY. "troctolite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "troctolite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O13-troctolite.html

AILSA ALLABY and MICHAEL ALLABY. "troctolite." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-troctolite.html

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