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Northwest Africa 11704
Basic information Name: Northwest Africa 11704
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11704
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 1127 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 342 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Mar 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11704 (NWA 11704)

Mauritania

Purchased: 2018 Jan

Classification: HED achondrite (Eucrite, polymict)

History: A batch of about 50 stones with similar appearance found together in Mauritania was purchased by John Higgins in January 2018 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting predominantly of gabbroic eucrite clasts, some ophitic eucrite clasts and sparse clasts of feldspathic diogenite in a finer grained matrix. Minerals include exsolved pigeonite, calcic plagioclase (exhibiting undulose to polycrystalline microstructure), silica polymorph, ilmenite, Ti-chromite, Ti-poor chromite, troilite and minor barite. Feldspathic diogenite clasts consist mainly of relatively ferroan orthopyroxene with subordinate anorthite and minor clinopyroxene.

Geochemistry: Orthopyroxene host (Fs58.5Wo4.6, FeO/MnO = 35), clinopyroxene exsolution lamella (Fs28.1Wo41.0, FeO/MnO = 34), orthopyroxene host (Fs44.5Wo2.2, FeO/MnO = 30), clinopyroxene exsolution lamella (Fs17.8Wo43.8, FeO/MnO = 25), plagioclase (An86.6Or0.8). Minerals in feldspathic diogenite clast: orthopyroxene (Fs33.2-33.8Wo1.7-2.4, FeO/MnO = 29-32, N = 2), clinopyroxene (Fs10.8Wo45.8, FeO/MnO = 21), anorthite (An95.4Or0.2).

Classification: Eucrite (polymict breccia).

Specimens: 26.6 g including one polished thin section at UWB; remainder with Mr. J. Higgins.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 Jan
Mass (g):1127
Pieces:many
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):58.5; 28.1
Wollastonite (mol%):4.6; 41.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):26.6
Type spec location:UWB
Main mass:J. Higgins
Comments:Work name JH18-1; 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. 107, in preparation (2018)
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   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 103 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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