| 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. |
| Genre: | Article |
| ProdID: | 70010757 |
| Citation Author: | Clark, J. R.; Papike, J. J. |
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| Citation End Page: | 1004 |
| Citation Issue: | 3752 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 2 |
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| Citation Search Results Text: | Eclogitic pyroxenes, ordered with P2 symmetry; 1966; Article; Journal; Science; Clark, J. R.; Papike, J. J. |
| Citation Start Page: | 1003 |
| Citation Volume: | 154 |
| Citation Year: | 1966 |
| Type: | citation/reference |
| Text: | Eclogitic pyroxenes, ordered with P2 symmetry; 1966; Article; Journal; Science; Clark, J. R.; Papike, J. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1966 00:00 -0600 |
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