[meteorite-list] Two Chassignites?

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:54:06 2004
Message-ID: <3C701C43.FFBD0895_at_lehrer1.rz.uni-karlsruhe.de>

Jamie posted:

> on page 208 of Richard Norton's Rocks From Space he says
> there are two Chassignites, one that was found in Antarctica.
> This must be a mistake, right?


Hello Jamie and List,

Yes and no ... let me explain :-)

When ALH 84025 was found, MacPherson et al. (1985) classified this
meteorite as a u n i q u e achondrite. As it consists almost entirely
of olivine, Prinz et al. (1986) thought it might be genetically related
to either Chassigny or Brachina which are petrologically similar. But
noble gas data and isotopic measurements soon revealed it was not
another Chassignite but a brachinite.

Best wishes,

Bernd
Received on Sun 17 Feb 2002 04:10:27 PM PST