[meteorite-list] Imilchil has a new name - Agoudal

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Thu, 2 May 2013 10:53:07 -0400
Message-ID: <CAKBPJW-7V1DL799XJCzDGQB59uuQo2pQgR7-Zf55bGzVPwVGQA_at_mail.gmail.com>

Hi List,

The Imilchil iron meteorite is now official. It's official name is "Agoudal"

Link - http://www.lpi.usra.edu/meteor/metbull.php?code=57354

Write up :

Agoudal 31?59.074?N, 5?30.917?W

Centre-South, Morocco

Found: 2000

Classification: Iron meteorite (IIAB)

History: (H. Chennaoui Aoudjehane, M. Aboulahris, FSAC) Two small
pieces of iron were collected in 2000 in the Agoudal area, High Atlas
Mountains, Morocco, and sold to tourists. In September 2011, one piece
was sold to a dealer in Errich, who recognized it as an iron
meteorite. During the last months of 2012, systematic searching by
meteorite hunters with metal detectors resulted in the discovery of a
large number of meteorites, mostly small. Many pieces were collected
on the surface or buried a few cm deep. The largest piece recovered
was 60 kg, buried ~50 cm below the surface. On 9 February 2013, H.
Chennaoui Aoudjehane, M. Aoudjehane and M. Aboulahris collected 200 g
of specimens; the listed coordinates are those of the largest piece
they recovered. The strewnfield is not yet clearly defined.

Physical characteristics: Total mass is >100 kg. Hundreds of small
pieces (1-100 g), many 100-1000 g, and a few pieces >1 kg, have been
recovered. The majority of collected material occurs as 2-5 cm,
irregularly shaped shrapnel pieces. Most pieces have a thin weathering
rind. Some smaller bullet-shaped (~cm-sized) fragments are rounded,
showing well-developed fusion crust.

Petrography: (L. Garvie, ASU) Decimeter-sized pieces show a coarse
pattern of irregular, interlocking kamacite grains; some grains with
sub-boundaries. Widmanst?tten pattern not evident in the small
sections studied. Grain boundaries commonly curved. Etched pieces
range from shiny with well-developed Neumann bands, to pieces with a
matte appearance, typical of the hatched ?-structure. The
shock-hatched regions show incipient recrystallization, with secondary
growth of irregularly-shaped (to 1 mm) kamacite. No plessite observed.
Schreibersite abundant occurring as cm-sized skeletal crystals at the
centers of kamacite crystals, as rhabdites, and as a grain boundary
precipitate. Rhabdites locally numerous as sharp, 10-25 ?m faceted
prisms. Scattered troilite nodules, to 1 cm. Troilite not surrounded
by schreibersite, but instead large skeletal schreibersite is situated
a few mm away. Heat-affected zone visible on some stones. Several of
the smaller pieces, and especially the rounded bullet-shaped stones,
have fusion crust and heated-affected zone of varying thickness; some
completely recrystallized.

Geochemistry: (C. Herd and G. Chen, UAb): ICP-MS data, Ni 5.5 wt%, Co
4.1 mg/g, Ga 58 ?g/g, Ir < 0.04 ?g/g and Au ~ 1 ?g/g.

Classification: Iron, IIAB. Structurally similar to Ainsworth.

Specimens: Type specimens include 2406 g, ASU; 17.5 g, UAb; 200 g, FSAC

Other names: This meteorite has been sold and traded under the name "Imilchil"

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Received on Thu 02 May 2013 10:53:07 AM PDT

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