Schiller effects and exsolution in sodium-rich plagioclases |
| |
| Authors: | Arne Olsen |
| |
| Institution: | 1. Department of Physics, University of Oslo, Norway
|
| |
| Abstract: | Plagioclase feldspars with mean compositions Ab91,3Or4,7An4,0 and Ab88,7An10,1Or1,2 have been studied by transmission electron microscopy and electron diffraction. The substructure consists of thin lamellae of albite and oligoclase. Two types of orientations of the lamellar planes were observed. The orientation of the more common type was found to change from (08 \(\bar 1\) ) to about ( \(\bar 1\) , 21, \(\bar 2\) ) as a function of the mean potassium content. The plane of the other type was found to be near ( \(\bar 7\) 12). Only the first type of lamellae produces visible Schiller colours. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
