![Labradorite [(Ca,Na)(Al,Si)4O8]
Labradorite is one of the plagioclase feldspars that lies Anorthite CaAl2Si2O8 and NaAlSi3O8. Compositionally, Labradorite is An50-An70 A. The distinctive play of colors is called labradorescence and is caused by the schiller effect: the result of light refracting within lamellar intergrowths resulting from phase exsolution on cooling in the Boggild miscibility gap, An48-An58.](http://25.media.tumblr.com/tumblr_lqwwe3HYcL1qi703wo1_400.png)
Labradorite [(Ca,Na)(Al,Si)4O8]
Labradorite is one of the plagioclase feldspars that lies Anorthite CaAl2Si2O8 and NaAlSi3O8. Compositionally, Labradorite is An50-An70 A. The distinctive play of colors is called labradorescence and is caused by the schiller effect: the result of light refracting within lamellar intergrowths resulting from phase exsolution on cooling in the Boggild miscibility gap, An48-An58.
![Grossular [Ca3Al2(SiO4)3] from Canada](http://24.media.tumblr.com/tumblr_lpzifzpjCS1qf9a94o1_500.jpg)
![mineralia: Gersdorffite [NiAsS] from Morocco
The white and green concretion at the lower right is probably an alteration product… I think that either the nickel or arsenate would cause a green color.](http://25.media.tumblr.com/tumblr_lq10pb5wVy1qgzn5jo1_500.jpg)
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