[meteorite-list] Rocks from Space Picture of the Day - December 9, 2008

From: bernd.pauli at paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: 09 Dec 2008 17:18:46 UT
Message-ID: <DIIE.000000AA00003605_at_paulinet.de>

Hi Michael, Matt, and List,

http://www.rocksfromspace.org/December_9_2008.html

MICHEL-LEVY M.C. (1988) A new component of the Mez?-Madaras
breccia: A microchondrule- and carbon-bearing L-related chondrite
(Meteoritics 23-1, 1988, 45-48):

Introduction (excerpt): The Mez?-Madaras L3 chondrite breccia is well known for
its numerous inclusions (xenoliths, clasts, lumps, .) . as well as for some highly
unequilibrated mineral associations which have been discovered in it: merrihueite*
and "ferric" silicates, cristobalite or trydimite, olivines and pyroxenes. These are
present in the host also called "normal Mez?-Madaras", in which many glass-rich
chondrules are found. Most of the inclusions are of L4-5 types, similar to the host
so that Binn calls them "cognate xenoliths". Some other inclusions are black .
[In] the black inclusion studied here . carbon is present, but the bulk analysis does
not allow us to classify it with the major carbonaceous chondrite groups.

* Formula: (K,Na)2(Fe,Mg)5Si12O30

Conclusion (excerpt): Among the various components of the Mez?-Madaras
chondrite, a carbon-bearing material, different from the known classes of
carbonaceous chondrites, is dispersed through the whole stone and has been
found in a large lump.

Best wishes,

Bernd

To: michael at spacerocksinc.com
    meteorite-list at meteoritecentral.com
Received on Tue 09 Dec 2008 12:18:46 PM PST