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Northwest Africa 4636
Basic information Name: Northwest Africa 4636
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4636
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 2.85 kg
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 279 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4636

Northwest Africa

Find: 2005

Mesosiderite

History: The meteorite was collected by an anonymous finder in the western part of the Sahara and bought by the main mass holder at a meteorite fair in Germany from two different dealers.

Physical characteristics: Several dark stones totaling 2850 g.

Petrography: (A. Greshake, MNB and M. Kurz, Kurz). The stony portion of the meteorite consists of dominant pyroxene, plagioclase, and phosphates. Minor phases include troilite, silica, and small metallic Fe-Ni grains. Metal is mostly kamacite.

Mineral compositions and geochemistry: Pyroxene (Fs31.1-35.0Wo4.8-9.1) and plagioclase (An94.5; range An91.8-95.5). Oxygen Isotopes: (I. A. Franchi and R. C. Greenwood, OU) The mean of two replicates δ17O = 2.09, δ18O = 4.38, Δ17O = -0.19 (all ‰).

Classification: Mesosiderite; minimal shock, moderate weathering.

Type specimens: A total of 29 g of sample plus one polished thin section are on deposit at MNB. The anonymous purchaser holds the main mass.

Data from:
  MB92
  Table 2
  Line 116:
Place of purchase:Germany
Date:2005
Mass (g):2850
Pieces:>2
Class:Meso
Type spec mass (g):29
Plots: O isotopes:  
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Kurz: M. Kurz, Schillerstrasse 7, D-34626 Neukirchen, Germany (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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