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Northwest Africa 12447
Basic information Name: Northwest Africa 12447
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12447
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 413 g
Classification
  history:
Recommended:  Brachinite    [explanation]

This is 1 of 48 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 27 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12447 (NWA 12447)

(Northwest Africa)

Find: 2004

Classification: Primitive achondrite (Brachinite)

History: Found in southern Morocco in 2004 and purchased by a German collector; the specimen was subsequently acquired by Craig Zlimen in August 2018.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate composed predominantly of olivine (with reduced magnesian rims) plus subordinate clinopyroxene and accessory intermediate plagioclase, chlorapatite, Ti-V-bearing chromite, kamacite, troilite and minor secondary barite. Grain boundaries and fractures are decorated with fine grained assemblages of Fe metal plus magnesian orthopyroxene.

Geochemistry: Olivine (cores Fa28.8-30.6, FeO/MnO = 48-64; rim Fa20.1, FeO/MnO = 36; N = 3), clinopyroxene (Fs10.3-10.6Wo44.9-44.8, FeO/MnO = 37-39, N = 2), orthopyroxene at grain boundaries (Fs20.3Wo0.8, FeO/MnO = 23), plagioclase (An34.9-35.9Or0.4, N = 2).

Classification: Brachinite. This ultramafic achondrite has many mineralogical features in common with NWA 7388 and NWA 7605 (Irving et al., 2013) and may be related to those specimens.

Specimens: 23.6 g including one polished thin section at UWB; remainder with Mr. C. Zlimen.

Bibliography:
  • Irving A.J., Kuehner S.M., and Ziegler K. (2013) Petrology and Oxygen Isotopic Composition of Brachinite-like Achondrites Northwest Africa 7388 And Northwest Africa 7605, and Evidence for Late-stage Methane-triggered Reduction. Lunar Planet. Sci. Conf. 44, abstract #2192. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Germany
Date:2004
Mass (g):413
Pieces:several
Class:Brachinite
Shock stage:low
Weathering grade:low
Fayalite (mol%):28.8-30.6
Ferrosilite (mol%):10.3-10.6
Wollastonite (mol%):44.9-44.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.6
Type spec location:UWB
Main mass:C. Zlimen
Comments:Work name ZLI04; submitted by A. Irving
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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography: 
Coordinates:Unknown.

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

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