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Grein 005
Basic information Name: Grein 005
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2015
Country: Niger
Mass:help 52.5 kg
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Iron, IIIAB
MB 106  (2018)  Iron, IIIAB
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 308 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 26 Jan 2017
Writeuphelp
Writeup from MB 106:

Grein 005        20°6’N, 10°37’E

Agadez, Niger

Purchased: 22 Dec 2015

Classification: Iron meteorite (IIIAB)

History: Found in November 2015 exposed on the surface by artisanal miners while prospecting for gold between Tehmet and Djado in the Tènéré Tafassasset. This is reportedly the second iron meteorite from the area. Six other masses with a total weight of 554 kg are likely from the same area, but neither find data nor sample material of these could be obtained, thus they are excluded from the reported mass.

Physical characteristics: The 52 kg mass is 39 × 25 × 18 cm and has the shape of a longitudinally split cone with the cone section showing minor concavity while the opposite surface is distinctly convex. Numerous regmaglypts measuring 1-3 cm across and 1-1.5 cm deep are present, and at least one troilite inclusion is observed. The specimen is coated with a thick layer of dark brown desert varnish.

Petrography: Polished sections display a well-developed Widmannstätten pattern of a medium octahedrite with a mean kamacite bandwidth of 1.0±0.2 mm. Neumann bands are visible within kamacite. Schreibersite and graphite are absent in the sections observed. Troilite is present in the form of rounded and bar-shaped inclusions ranging from 2-20 mm across the longest axis, partly surrounded by thin swathing kamacite. Fractures up to 1 mm wide penetrate the meteorite along the kamacite lamellae and are filled with terrestrial oxides, otherwise the interior weathering is very moderate. Fusion crust and heat-affected zones are mostly absent.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd and G. Chen UAb): Ni = 8.0, Co = 0.51 (both wt%); Ir = 13.9, Ga = 22, Ge = 83, W = 1.4, Re = 1.4, Os = 7.3, Cu = 210, Ru = 12.7, Pd = 2.0, Pt = 15.7 (all μg/g).

Classification: (C. Herd, UAb): IIIAB iron, medium octahedrite.

Specimens: Type specimen consisting of two representative slices (67.6 and 49.4 g) at UAb. Main mass with S. Buhl.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Agadez
Origin or pseudonym:Quaternary reg and alluvial gravel hamad
Place of purchase:Agadez
Date:P 22 Dec 2015
Latitude:20°6'N
Longitude:10°37'E
Mass (g):52500
Pieces:1
Class:Iron, IIIAB
Shock stage:moderate
Weathering grade:moderate
Classifier:C. Herd, UAb
Type spec mass (g):117.0
Type spec location:UAb
Main mass:S. Buhl
Finder:S. Icha
Comments:Field name B-470, also referred to as "Northeast Niger 002 (NEN 002)".; submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2018) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. in press.
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Svend Buhl, Meteorite-Recon      
Geography:

Niger
Coordinates:
     Recommended::   (20° 6'N, 10° 37'E)

Statistics:
     This is 1 of 31 approved meteorites from Agadez, Niger
     This is 1 of 41 approved meteorites from Niger (plus 1 unapproved name)
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