Si-Al ordering in nephelinesSi-Al ordering in nephelines

View file »
Link:
http://hdl.handle.net/2027.42/47315
Collection:
Creators:
Peacor, Donald R. Dollase, Wayne A.
Contributors:
Ann Arbor Department of Geology and Mineralogy, University of Michigan, Ann Arbor Geology Department, University of California, Los Angeles
Description
Different degrees of Si-Al ordering are demonstrated to exist in nepheline on the basis of five crystal structure refinements on specimens with different geologic origins and laboratory treatments. Disorder increases in the sequence; gneissic-igneous plutonic-volcanic nepheline and appears to increase as a result of laboratory heat treatment. The four independent tetrahedral sites can be divided into two pairs with one pair of sites always less ordered than a second pair in a simple regular relationship. 
Language
en_US 
Publisher
Springer-Verlag 
Access:
Instructions in case access is denied