Eclogitic pyroxenes, ordered with P2 symmetry
Science
By: J. R. Clark and J. J. Papike
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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) (Mg0.4Fe2+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.
Suggested Citation
Clark, J.R., and Papike, J.J., 1966, Eclogitic pyroxenes, ordered with P2 symmetry: Science, v. 154, no. 3752, p. 1003-1004, https://doi.org/10.1126/science.154.3752.1003.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Eclogitic pyroxenes, ordered with P2 symmetry |
| Series title | Science |
| DOI | 10.1126/science.154.3752.1003 |
| Volume | 154 |
| Issue | 3752 |
| Year Published | 1966 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Description | 2 p. |
| First page | 1003 |
| Last page | 1004 |
| Country | United States |
| State | California |
| County | Marin County |
| Other Geospatial | Tiburon Peninsula |