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quartz porphyry

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

quartz porphyry (elvan) A porphyritic microgranite, microgranodiorite, or microtonalite.

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AILSA ALLABY and MICHAEL ALLABY. "quartz porphyry." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "quartz porphyry." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 1, 2009). http://www.encyclopedia.com/doc/1O13-quartzporphyry.html

AILSA ALLABY and MICHAEL ALLABY. "quartz porphyry." A Dictionary of Earth Sciences. 1999. Retrieved December 01, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-quartzporphyry.html

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