Hello List, salut Confrère Pierre-Marie,
Do you know of which meteorite it's about or where I could get more information?
That's the Lujan meteorite:
1. Catalogue of Meteorites:
A piece of about 50g was found 6 m deep in Quaternary formations below the
remains
of a megatherium, M. Kantor, Rev. Mus. La Plata, 1920, 25, p.117. A thoroughly
oxidised
iron, mainly limonite. Very little preserved. Coordinates given as 34° 33' S.,
059° 08' W, and
date of find as 1892, L.M. Villar, Cienc. Investig., 1968, 24, p.302, but it
must have been
found before that year.
2. Vagn Buchwald:
BUCHWALD, V.F. (1975) Handbook of Iron Meteorites, Volume 2, p.790:
Lujan, Buenos Aires, Argentina
Approximately 34° 40' S, 059° 22' W
A piece of about 50 grams was found six meters deep in Quaternary formations
below remains
of a megatherium* (Kantor 1921; Radice 1959). It has been listed as a
mesosiderite (?) by Hey
(1966), but his classification is doubtful.
The 33 g specimen in the La Plata Museum measures 4.5 x 3 x 2.5 cm and is an
iron thoroughly
oxidized to limonite. The specific gravity is approximately 4.5, and the
specimen is almost nonmagnetic.
In the author's opinion the Lujan material is an entirely corroded octahedrite
rather than a mesosiderite.
A close study of a modern polished section might help to solve the question,
since it might be possible
to identify remnants of any octahedral structure and perhaps even find some
untransformed schreibersite
or troilite.
3. Meteorite Magazine:
GIANFRANCO M. (1999) The "fossil" meteorite of
Lujan (M! Nov. 1999, Vol. 5, No. 4, pp. 35):
Fe2O3 = 83.16%
FeO = 0.26%
NiO = 3.45%
Al2O3 = 0.80%
CaO = 0.54%
MnO = 0.21%
SiO2 = 1.72%
H2O = 10.47%
Cheers, salut,
Bernd
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