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Andesine labradorite

Posted by Michelle Gauto  
Michelle Gauto
Andesine labradorite
February 14, 2008 04:01PM
Goodmorning to all. I am looking for info on Andesine labradorite. Can anyone help please.
Re: Andesine labradorite
February 14, 2008 04:45PM
Your question is very general, and you don't say what sort of info you need (composition, occurence, diagnostic physical properties, etc), so it is only possible to give a general answer.

Those names are old terms for arbritrary divisions within the albite-anorthite feldspar series. They refer to feldspar with compositional ranges from 30-50% anorthite (=andesine), and 50-70% anorthite (=labradorite) respectively. They are still used in petrological descriptions, but they are not distinct mineral species.

Pete N.



Edited 1 time(s). Last edit at 02/14/2008 04:46PM by Peter Nancarrow.
avatar Re: Andesine labradorite
February 27, 2008 04:49PM
us    
Althoughthe nomenclature for the plagioclase feldspars has been recently simplified, traditionally andesine and labradorite have been considered two different members of the plagioclase feldspar group. If you are looking for information on their chemical and optical properties, and general occurence, I would recomend "An Introduction to the Rock-Forming Minerals" by Deer, Howie, and Zussman.
Mary M
Re: Andesine labradorite
May 06, 2008 02:43PM
For those of you that have had questions about Andesine Labradorite, I am posting a link to ISG where they are conducting an on going analysis of this gemstone. Very interesting information is finally coming to light.

[www.yourgemologist.com]
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