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Eclogitic pyroxenes, ordered with P2 symmetry

Science

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Abstract

X-ray diffraction crystal-structure analysis of omphacite from eclogite, Tiburon Peninsula, Marin County, California, shows that this clinopyroxene has P2 symmetry with a nearly ordered distribution of the multiple cation content defined by its approximate formula: (Na0.5Ca0.5) (Mg 0.4Fe2+0.1Al0.4Fe3+0.1)Si2O6. Na+ and Ca2+ tend to assume alternate locations in the structure, and (Mg,Fe2+) octahedra alternate with Al3+ or (Al,F3+) octahedra in chains along c.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Eclogitic pyroxenes, ordered with P2 symmetry
Series title:
Science
Volume
154
Issue:
3752
Year Published:
1966
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1003
Last page:
1004
Number of Pages:
2