Eclogitic pyroxenes, ordered with P2 symmetry
January 1, 1966
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.
Citation Information
| Publication Year | 1966 |
|---|---|
| Title | Eclogitic pyroxenes, ordered with P2 symmetry |
| Authors | J. R. Clark, J. J. Papike |
| Publication Type | Article |
| Publication Subtype | Journal Article |
| Series Title | Science |
| Index ID | 70010757 |
| Record Source | USGS Publications Warehouse |