High resolution electron microscopic characterization of phyllosilicates and finding of a new type with 11A structure in Yamato-74662

Details High resolution electron microscopic characterization of phyllosilicates and finding of a new type with 11A structure in Yamato-74662 High resolution electron microscopic characterization of phyllosilicates and finding of a new type with 11A structure in Yamato-74662

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982polre..25..131a&link_type=abstract

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

Physics

1

Meteorites, Antarctic Meteorites, Electron Microscopy, Characteristics, Phyllosilicate, Classification, Structure, Yamato Meteorites, Yamato 74662, Laboratory Studies, Samples, Meteorite

Scientific paper

Matrix materials in Yamato-74662 have been examined by HREM and AEM. Under microscopic observations, phyllosilicates in Yamato-74662 were found: (1) as matrix materials, (2) in irregular cavities, and (3) replacing pyroxene and olivine grains. Five types of phyllosilicates in the matrix were observed by HREM; (1) 7A platy phyllosilicate, (2) 7A poorly organized tubular phyllosilicate, (3) 17A platy phyllosilicate, (4) poorly organized 7A layer structures with interlayering of 5A layer structure and (5) 11A platy phyllosilicate. Parallel intergrowth of the 11A mineral and 7A berthierine, and characteristic HREM suggest that the 11A mineral is a new phyllosilicate with an interstratified structure of serpentine-like and brucite-like layers. Mineralogy and texture of the matrix suggest that the phyllosilicates were derived by alteration from such precursor materials as CV chondrites, and experienced some mixing or brecciation process after (or during) alteration.

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