[meteorite-list] Brachina and Eaegles Nest

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 10:16:34 2004
Message-ID: <DIIE.0000004800000DDA_at_paulinet.de>

Hi Christian and List,

> I heard about that Brachina and Eagles Nest may probably be
> from the same fall. Does anybody know further informations or
> is this just a false report.

No, it is not "a false report". Some scientists like A.W.R. Bevan say it is
another stone of Brachina i n s p i t e o f mineralogical differences*,
Nehru C.E. et al. say they can't be paired b e c a u s e o f these
differences.

* Brachina is fine-grained, Eagle's Nest is coarser grained (than Brachina).
Brachina is composed of olivine, augite, plagioclase, and orthopyroxene.
Eagle's Nest contains only olivine + ca. 7% augite.

T.D. Swindle warns that analyses of the chemical composition
of Eagles Nest are hampered by extensive terrestrial weathering.

References:

GOODRICH C.A. (1998) Brachinites: Residues from low degrees of
melting of a heterogeneous parent body (Meteoritics 33-4, 1998, A060).

SWINDLE T.D. et al. (1998) Noble gases, bulk chemistry, and petrography
of olivine-rich achondrites Eagles Nest and Lewis Cliff 88763: Comparison
to brachinites MAPS 33, 1998, 31-48).

Best wishes,

Bernd

To: christian.anger_at_aon.at
Cc: meteorite-list_at_meteoritecentral.com
Received on Sat 16 Aug 2003 03:55:04 PM PDT