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Northwest Africa 11677
Basic information Name: Northwest Africa 11677
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11677
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 499 g
Meteoritical Bulletin:  MB 107  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 382 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Mar 2018
Writeup from MB 107:

Northwest Africa 11677 (NWA 11677)

(Northwest Africa)

Purchased: 2017 Nov

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Darryl Pitt in November 2017 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Polymict breccia consisting predominantly of eucrite clasts (exhibiting intersertal, subophitic, diabasic and gabbroic textures) and related crystalline debris, together with ~10 vol.% of diogenitic orthopyroxene (exhibiting more ferroan reaction rims against the matrix). Other minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, ilmenite, Ti-chromite and troilite.

Geochemistry: Diogenitic orthopyroxene (cores Fs31.3-33.5Wo3.6-5.3, FeO/MnO = 35-36; rim Fs53.8Wo3.8, FeO/MnO = 32; N = 3), orthopyroxene host (Fs61.2Wo1.5, FeO/MnO = 36), clinopyroxene exsolution lamella (Fs26.0Wo42.9, FeO/MnO = 34), low-Ca pyroxene host (Fs45.1Wo7.1, FeO/MnO = 31), augite exsolution lamella (Fs22.6Wo39.1, FeO/MnO = 30), augite (Fs30.1Wo37.4, FeO/MnO = 35), plagioclase (An88.7-89.1Or0.3-0.6, N = 2).

Classification: Eucrite (polymict breccia).

Specimens: 21.1 g including one polished thin section at UWB; main mass with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Nov
Mass (g):499.2
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):61.2; 26.0
Wollastonite (mol%):1.5; 42.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.1
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 324; submitted by A. Irving
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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