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Orgueil and Comets - Follow-up

Matt Morgan schrieb:

> This is not only due the high water content (~20%?)

Only 5 CI specimens are known:

Alais - Ivuna - Orgueil - Revelstoke - Tonk

There is  o n e  Japanese Antarctic meteorite in my database that may
belong to the CI group:

Yamato 82162

but it seems to have unusual characteristics:

K.Yamamoto et al. (1990) REE characteristics of Yamato 82162 and Yamato
86720 meteorites and their inference to classification (Proc. NIPR Symp.
Antarct. Mets. 3rd, 69-79).

A. Bischoff et al. (1991) Mineralogy and petrography of the  a n o m a l
o u s carbonaceous chondrites Yamato 86720, Yamato 82162 and Belgica
7904 (Proc. NIPR Symp. Antarct. Mets. 4th, 226-246).

M. Zolensky et al. (1991) Mineralogy and thermal history of Yamato
82162, Yamato 86720 and Belgica 7904 (abs. Symp. Antarct. Mets. 16th,

Surprisingly, my US Antarctic database doesn't have any CI or C1
carbonaceous chondrites at all!

EET 83334 is classified as CM1-2 and does not belong here.

According to A.E. RUBIN [Mineralogy of meteorite groups (Meteoritics
32-2, 1997, 231)], the CI carbonaceous chondrites are chondrule-free and
volatile-rich whereas CM carbonaceous chondrites are

Best wishes from Germany,


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