Northwest
Africa 2019
Northwest
Africa
Purchased 2003
Mesosiderite (MES)
A
mass of 534 g was purchased by P. Thomas in 2003.
Classification and mineralogy (M. Bourot-Denise,
MNHNP): the silicate portion is diogenitic, about
90% consist of large (400 µm), angular, chemically
homogeneous crystals of orthopyroxene (Fs28.4);
olivine is absent; augite (Fs13.4 Wo41.9) is rare;
plagioclase (An89.8) is present as large patches,
homogeneously distributed; silica forms a few patches
and merrillite is associated with metal. Fe-Ni
metal, forms large, jagged grains; it is mainly
kamacite, with minor tetrataenite generally associated
with schreibersite; troilite is in small grains.
Paired with NWA 1827 and NWA 1879; total mass is
estimated to be larger than 60 kg. Weathering grade
is W1. Specimens: type specimen 31 g, MNHNP; main
mass with buyer.
Info:
Analyses and classifications by M. Bourot-Denise,
MNHNP. Magnetic measurements by P. Rochette, CEREGE,
Marseille. Type specimen, MNHN.
Meteoritical
Bulletin Database
Slices
available.
|
NWA
2019, MES
© Ph.
Thomas (click to enlarge)
NWA
2019, MES
© Ph.
Thomas (click to enlarge)
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