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Northwest Africa 8261
Basic information Name: Northwest Africa 8261
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8261
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 559 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 May 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8261 (NWA 8261)

(Northwest Africa)

Purchased: 2014 Jan

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Kuntz in January 2014 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Polymict breccia composed predominantly of crystalline debris related to sparse lithic clasts of gabbroic eucrite, along with rare clasts of much finer grained, intersertal-textured eucrite, autolithic breccia clasts (i.e., breccia within breccia), and rare fragments of diogenitic orthopyroxene. Gabbroic eucrite clasts consist of exsolved pigeonite and polycrystalline calcic plagioclase with accessory silica polymorph, ilmenite, chromite, troilite and barite. Isolated grains of olivine, more ferroan augite, and ferroan pigeonite are also present.

Geochemistry: Diogenitic orthopyroxene (Fs23.9Wo2.3, FeO/MnO = 27), host orthopyroxene (Fs60.2Wo3.2, FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs28.9Wo41.4, FeO/MnO = 29), olivine (Fa54.0, FeO/MnO = 45), ferroan augite (Fs35.0Wo40.0, FeO/MnO = 29), ferroan pigeonite (Fs62.0Wo24.2, FeO/MnO = 30).

Classification: Eucrite, polymict breccia.

Specimens: 20.9 g including a polished thin section at UWB. The remainder is held by Kuntz.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2014 Jan
Mass (g):559
Pieces:26
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):54
Ferrosilite (mol%):23.9; 60.2; 28.9
Wollastonite (mol%):2.3; 3.2; 41.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.9
Type spec location:UWB
Main mass:F. Kuntz
Comments:K202; 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)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mike Markowitz   
Piotr gural100   
Stefano De Fazi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

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