Encyclopedia.com > Dictionaries, Thesauruses, Pictures, and Press Releases > A Dictionary of Earth Sciences > January 1999

peralkaline

A Dictionary of Earth Sciences | 1999 | 299 words | Copyright

peralkaline A chemical classification applied to felsic igneous rocks in which there are more molecules of (Na2O + K2O) than of Al2O3. Rocks with such a chemistry crystallize alkali-rich ferromagnesian minerals such as aegirine, aegirine-augite, barkevikite, and arfvedsonite. See also METALUMINOUS.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

AILSA ALLABY and MICHAEL ALLABY. "peralkaline." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "peralkaline." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-peralkaline.html

AILSA ALLABY and MICHAEL ALLABY. "peralkaline." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-peralkaline.html

Learn more about citation styles

Find thousands of answers for hundreds of subjects at Answers Encyclopedia .

All answers verified by trusted sources at Encyclopedia.com

Try Answers Encyclopedia now!

For students and teachers!

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including:

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including: