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RBT 04133   contributed by AMN   MetBul Link


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View all entries for   Meteorite (2)   AMN (153)


Fall not observed. Found 2004 in Antarctica.450 grams. 71 x 62 x 58 mm.   CV3
Location Map of Antarctic Finds



AMN writes:
Macroscopic Description - Cecilia Satterwhite
Black fusion crust covers 40% of the meteorite’s exterior surface. Abundant white inclusions (some very large) are visible on the exterior. Other smaller inclusions are gray and some are weathered. Areas without fusion crust are grayish black with brown weathered areas. Fractures penetrate the surface. The interior is a coarse grained matrix, weathered a rusty brown with some gray areas visible. Abundant white, gray and rusty inclusions/chondrules are visible on the interior.
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach and Cari Corrigan
The section exhibits large (up to 2 mm), well-defined chondrules and CAI’s in a dark matrix of FeO-rich phyllosilicate. Metal is present in only modest abundances. Weathering is moderate. Silicates are unequilibrated; olivines range from Fa1-12, with many Fa0-2, and pyroxenes from Fs1-2. The meteorite is a CR2 chondrite.
Reclassification Notes (AMN 38,2)
RBT 04133 was classified as a CR2 in the February 2008 (Vol.31 No. 1) newsletter. More detailed information has led to a better understanding of this sample, which we here re-classify to CV3 (reduced), based on the study of Davidson et al. (2014) Meteoritics and Planetary Science 49, No. 12, 2133–2151. Quoting from their paper: “Data presented here conflict with its initial classification as a CR2. Petrographically, RBT 04133 appears to be a CV3red, based on the presence of large CAIs and chondrules, the apparent lack of magnetite, and a matrix composition of Fa59–60. This is in agreement with its whole-rock C, N, and O-isotope compositions, and the Raman spectral characteristics of its IOM.”


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Don Cracraft 2650
 10/25/2020 7:52:00 AM
Great pics! Nice to see the condrules
Bernd Pauli
 10/25/2020 6:22:34 AM
I'm not an expert but, judging from its visual appearance, my first guess would have been CV and not CR.
 

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