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Northwest Africa 1645
Basic information Name: Northwest Africa 1645
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1645
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 129 g
Classification
  history:
Meteoritical Bulletin:  MB 88  (2004)  Mesosiderite-B
MetBase:  v. 7.1  (2006)  Mesosiderite-B
Recommended:  Mesosiderite-B    [explanation]

This is 1 of 7 approved meteorites classified as Mesosiderite-B.   [show all]
Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites
Writeuphelp
Writeup from MB 88:

Northwest Africa 1645

Morocco

Purchased 2002 April

Mesosiderite

A very fresh, complete stony-iron meteorite of 129 g was purchased from a dealer in Rissani by M. Farmer in 2002 April.  Classification and mineralogy (A. Irving and S. Kuehner, UWS): Medium-grained, relatively homogeneous assemblage of orthopyroxene (45%), plagioclase (15%), metal (20%), troilite (12%), chromite (8%) and accessory merrillite, with an unbrecciated, plutonic igneous texture.  The two-phase Fe-Ni metal grains consist of rounded regions of taenite (30 wt% Ni) within kamacite (5 wt% Ni).  Compositions of orthopyroxene (Fs29.8-31.0Wo3.1-3.5, FeO/MnO = 26.9-30.3) and plagioclase (An89.7-90.5Or0.3-0.6) are consistent with those in mesosiderites assigned to class B. Oxygen isotopes (D. Rumble, CIW): replicate analyses of acid-washed silicate material by laser fluorination gave δ18O = 3.79‰, δ17O = 1.76‰, Δ17O = -0.25 ± 0.02‰.  Specimens: type specimens, 20 g and one polished thin section, UWS; main mass, MFarmer.

Data from:
  MB88
  Table 4
  Line 14:
Origin or pseudonym:Morocco
Place of purchase:Rissani
Date:P Oct 2002
Mass (g):129
Pieces:1
Class:Mes
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Main mass:MFarmer
Plots: O isotopes:  
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Don Edwards   
Shinishi Kato   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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