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

chloritoid

A Dictionary of Earth Sciences | 1999 | 477 words | Copyright

chloritoid (ottrelite) A member of the nesosilicates with the formula (Fe2+,Mg)(Al,Fe3+)Al3O2[SiO4]2(OH)4 and an important metamorphic index mineral; sp. gr. 3.51–3.80; hardness 6.5; monoclinic or triclinic; crystals tabular, pseudohexagonal; dark green to black; occurs in regionally metamorphosed pelites with a high Fe3+: Fe2+ ratio at low metamorphic grades; it develops at the same time as biotite and changes to staurolite with increasing temperature and pressure.

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

  • MLA
  • Chicago
  • APA

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

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

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