Lunar clinopyroxenes: Chemical composition, structural state, and texture
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Abstract
Single-crystal x-ray diffraction, microprobe, optical and electron optical examinations of clinopyroxenes from Apollo 11 lunar samples 10003, 10047, 10050, and 10084 show that generally the crystals are composed of (001) augite-pigeonite intergrowths in varying ratios. Transmission electron micrographs reveal abundant exsolution lamellae, many only 60 Å thick. In addition to the phase inhomogeneities, primary chemical inhomogeneities are clearly demonstrated. There are reciprocal relationships between calcium and iron and between Ti4+ + 2Al and R2+ + 2Si. Our evidence suggests that a chemically inhomogeneous subcalcic C2/c augite was the only primary pyroxene from which pigeonite later exsolved.
Suggested Citation
Ross, M., Bence, A., Dwornik, E., Clark, J.R., Papike, J.J., 1970, Lunar clinopyroxenes: Chemical composition, structural state, and texture: Science, v. 167, no. 3918, p. 628-630, https://doi.org/10.1126/science.167.3918.628.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Lunar clinopyroxenes: Chemical composition, structural state, and texture |
| Series title | Science |
| DOI | 10.1126/science.167.3918.628 |
| Volume | 167 |
| Issue | 3918 |
| Year Published | 1970 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Description | 3 p. |
| First page | 628 |
| Last page | 630 |
| Other Geospatial | Moon |