Pyroxene-spinel intergrowths in lunar and terrestrial pyroxenes

Details Pyroxene-spinel intergrowths in lunar and terrestrial pyroxenes Pyroxene-spinel intergrowths in lunar and terrestrial pyroxenes

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.1889o&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 2. (A77-34651 15-91) New York, Pergamon

Physics

Geochemistry, Lunar Rocks, Pyroxenes, Spinel, Anorthosite, Apollo 16 Flight, Crystal Growth, Lunik 20 Lunar Probe, Petrology

Scientific paper

The paper describes the oriented intergrowth of spinel and pyroxene in a pigeonite from Luna 20, an augite from Apollo 16 anorthosite 67075, and an orthopyroxene from a spinel lherzolite nodule from the San Quintin volcanic field, Mexico. Using Mo K alpha radiation, photographs were taken of small, hand-picked single-crystals. A mechanism of exsolution is suggeted in which the oxygen framework remains intact and spinel nuclei are formed by the migration of cations from interstitial sites and tetrahedral sites in the original non-stochimetric pyroxene.

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