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Northwest Africa 11427
Basic information Name: Northwest Africa 11427
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11427
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 320 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 274 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Oct 2017
Writeup from MB 106:

Northwest Africa 11427 (NWA 11427)

(Northwest Africa)

Purchased: 2017 Apr

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Fabien Kuntz in April 2017 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Melt-matrix breccia consisting of shocked gabbroic eucrite clasts in a sparse heterogeneous matrix exhibiting quench and flowage textures. Gabbroic eucrite clasts are composed mainly of microcrystalline clinopyroxene (pale orange in thin section) and polycrystalline calcic plagioclase with accessory silica polymorph, chromite, ilmenite, troilite and barite. Clinopyroxenes (formerly exsolved pigeonite) now consist of diffuse heterogeneous lamellae of pigeonite within host augite, and appear to have been thermally annealed. Secondary calcite and barite are present.

Geochemistry: High-Ca pyroxene host (Fs28.9-31.4Wo43.7-41.1, FeO/MnO = 32-33, N = 2), low-Ca pyroxene exsolution lamellae (Fs59.3Wo17.3; Fs48.6Wo20.1; FeO/MnO = 31-32; N = 2), plagioclase (An87.8-87.9Or1.2-0.8, N = 2).

Classification: Eucrite (gabbroic, melt matrix breccia).

Specimens: 23.05 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2017 Apr
Mass (g):320.1
Shock stage:high
Weathering grade:moderate
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.05
Type spec location:PSF
Main mass:F. Kuntz
Comments:Work name K327; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mike Markowitz   
Ryan Upchurch   

     This is 1 of 9344 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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