[meteorite-list] Red spots on Tatahouines?

From: bernd.pauli at paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: 29 Sep 2009 10:06:41 UT
Message-ID: <DIIE.0000008700004083_at_paulinet.de>

Hi Melanie, Jeff, Werner, and List,

BARRAT J.A. et al. (1999) The Tatahouine diogenite: Mineralogical
and chemical effects of sixty-three years of terrestrial residence
(MAPS 34-1, 1999, 091-097, excerpts):

"The crystals of orthopyroxene ... contain many inclusions ... of silica, troilite,
 chromite, and *metal*. The silica inclusions ... contain silica with either metal
 (Fe, 98%; Ni + Co, 2%) or chromite."

and:

"The samples collected in 1994 contain secondary minerals, which clearly developed
in the soil during their 63 years of terrestrial residence. First, *Fe stains* replace metal
or troilite inclusions on the surfaces of the clasts in contact with soil or inside fractures.
Second, yellowish to *light orange calcitic aggregates* were found in some samples.
They mainly occur as a partial filling with a rosette texture or completely fill some
fractures (ca. 100 ?m wide)."

Best wishes,

Bernd
Received on Tue 29 Sep 2009 06:06:41 AM PDT