Alkali feldspar
Wikipedia on Answers.com:
Top
Alkali feldspar
The alkali feldspar group are those feldspar minerals rich in the alkali elements, potassium and sodium. The alkali feldspars include albite, anorthoclase, microcline, orthoclase and sanidine.[1] Albite is considered as one of the alkali feldspars according to its chemical composition and it is also the alkali endmember of the plagioclase series.[2]
Potassium and sodium feldspars are not perfectly miscible in the melt at low temperatures, intermediate compositions of the alkali feldspars therefore occur only in higher temperatures environments.[2]
References
- ^ "Alkali Feldspar". mindat.org. http://www.mindat.org/min-118.html. Retrieved 04-12-2011.
- ^ a b Klein, Cornelis and Cornelius S. Hurlbut, Jr. Handbook of Mineralogy, Wiley, pp. 446-449 (Fig. 11-95 ISBN 0-471-80580-7
 |
This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it. |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Post a question - any question - to the WikiAnswers community:
Copyrights:
Wikipedia on Answers.com
This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article Alkali feldspar.
Read more
Mentioned in
leucite phonolite
(petrology)
nepheline monzonite
(petrology)
quartz monzonite
(petrology)
alaskite
(petrology)
granite
(petrology)
» More