Lunar Clinopyroxenes: Chemical Composition, Structural State, and Texture

Details Lunar Clinopyroxenes: Chemical Composition, Structural State, and Texture Lunar Clinopyroxenes: Chemical Composition, Structural State, and Texture

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..628r&link_type=abstract

Science, Volume 167, Issue 3918, pp. 628-630

Computer Science

3

Scientific paper

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.

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