A new layered mineral from the Mighei carbonaceous chondrite

Details A new layered mineral from the Mighei carbonaceous chondrite A new layered mineral from the Mighei carbonaceous chondrite

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.306..354t&link_type=abstract

Nature (ISSN 0028-0836), vol. 306, Nov. 24, 1983, p. 354-356.

Computer Science

12

Carbonaceous Chondrites, Meteoritic Composition, Mineralogy, Chondrule, Electron Microscopy, High Resolution, Metal Oxides, Microstructure, Silicates

Scientific paper

The poorly characterized phase (PCP) of the Mighei CM2 carbonaceous chondrite is investigated using high-resolution TEM. Electron-microprobe analyses of samples from both olivine chondrules and the matrix are included in a table. Chondrule PCP is found to have higher concentrations of S and Ni and lower concentrations of Si, Mg, and Al than matrix PCP. TEM shows that PCP in this chondrite is an intergrowth of three phases (in various proportions): a major component containing Fe, S, Ni, and O in wavy rolled layers spaced about 5.4 A apart, an Fe-rich serpentinelike phyllosilicate with 7-A layer spacing, and submicron grains of magnetite, chromite, and phosphate. It is proposed that chondrule PCP contains mainly the 5-A phase with some grains, while matrix PCP consists mostly of the 5-A and 7-A phases.

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