Merrillite - A whitlockite-group mineral in Yamato-75 chondrites

Details Merrillite - A whitlockite-group mineral in Yamato-75 chondrites Merrillite - A whitlockite-group mineral in Yamato-75 chondrites

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982polre..25..124m&link_type=abstract

(Symposium on Antarctic Meteorites, 7th, Tokyo, Japan, Feb. 19, 20, 1982) National Institute of Polar Research, Memoirs, Special

Computer Science

Meteorites, Antarctic Meteorites, Merrillite, Whitlockite, Mineralogy, Chondrites, Stony Meteorites, Laboratory Studies, Samples, Meteorite

Scientific paper

Various sizes of merillite of whitlockite-group minerals (from 20 to 750 microns in length) occur as irregularly shaped grains in Yamato-75 chondrites. The merrillite in the Yamato-75135,93 chondrite coexists with olivine, pyroxene, plagioclase, chromite and/or metal phases in the matrix. This calcium magnesium phosphate, with small amounts of Na and Fe, shows compositional variation from grain to grain larger than that in an H6 chondrite, but smaller than that of lunar rocks. Electron microprobe analysis and textural evidence indicate that the merrillite was initially present as molten droplets, interstitial to olivine, and coexisted with orthopyroxene and plagioclase, and/or chromite clusters at the stage of matrix-formation induced by multiple impact metamorphic events.

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