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Northwest Africa 1457
Basic information Name: Northwest Africa 1457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1457
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 52 g
Classification
  history:
Meteoritical Bulletin:  MB 87  (2003)  Winonaite
MetBase:  v. 7.1  (2006)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 35 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Writeuphelp
Writeup from MB 87:

Northwest Africa 1457

Morocco

Purchased 2001 December

Achondrite (winonaite)

Seven small stones with a total weight of 52 g were purchased from a Moroccan dealer by A. and G. Hupé (xHupé) in 2001 December. Classification and mineralogy (A. Irving and S. Kuehner, UWS): medium-grained, equilibrated metamorphic texture with triple junctions among mineral grains. Abundant enstatite (Fs6Wo1.5, FeO/MnO = 15) and forsteritic olivine (Fa5, FeO/MnO = 18) with subordinate diopside (Fs2.8Wo44, FeO/MnO = 8), sodic plagioclase (Ab82Or4), Ni-poor Fe-Ni metal, troilite, schreibersite, Cr-rich chromite, and Cl-rich apatite. Daubreelite occurs as blades within some troilite grains. Rare chromite grains (up to 20 µm; 66 wt% Cr2O3; Cr/ (Cr+Al) = 0.870; Mg/(Mg+Fe) = 0.682) are associated with troilite. Grain boundaries are veined by heterogeneous Ni­free iron oxides and/or hydroxides. Oxygen isotope composition (D. Rumble, CIW): analyses of two whole rock fragments by laser fluorination gave δ18O = +5.1 ± 0.1‰; δ17O = +2.3 ± 0.1‰; ∆17O = –0.40 ± 0.03‰. The texture, mineralogy and oxygen isotopic composition of this sample match the criteria for winonaites given by Benedix et al. (1998). Specimens: type specimen, 10 g, and one polished thin section, UWS; main mass, xHupé.

Data from:
  MB87
  Table 8
  Line 84:
Place of purchase:Zagora
Date:P Feb 2002
Mass (g):52
Pieces:7
Class:Win
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):10
Main mass:Hupé
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)
xHupé: (old address—now see GHupé or AHupé) G. and A. Hupe, 2616 Lake Youngs Court SE, Renton, WA 98058., United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Shinishi Kato   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Dirk Hohmann   
John Creech, Victoria University of Wellington   
Woreczko Jan & Wadi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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