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Northwest Africa 11305
Basic information Name: Northwest Africa 11305
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11305
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 2.82 kg
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 199 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Oct 2017
Writeup from MB 106:

Northwest Africa 11305 (NWA 11305)

(Northwest Africa)

Purchased: 2017 Feb

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Darryl Pitt in February 2017 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of lithic eucrite clasts (exhibiting both fine-intersertal and gabbroic textures) plus related mineral debris in a fine grained matrix. Minerals are exsolved pigeonite (orange in thin section), calcic plagioclase (polycrystalline), silica polymorph, Ti-chromite, troilite and fayalite.

Geochemistry: Orthopyroxene host (Fs61.0-62.4Wo3.1-3.0, FeO/MnO = 31-36, N = 2), clinopyroxene exsolution lamellae (Fs28.1-28.2Wo42.0-42.9, FeO/MnO = 27-31, N = 2), fayalite (Fa71.2-78.0, FeO/MnO = 38-45, N = 2), plagioclase (An89.8-90.6Or0.6-0.7, N = 2).

Classification: Eucrite (breccia).

Specimens: 21.2 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2017 Feb
Mass (g):2824
Shock stage:high
Weathering grade:low
Fayalite (mol%):71.2-78.0
Ferrosilite (mol%):61.0-62.4; 28.1-28.2
Wollastonite (mol%):3.1-3.0; 42.0-42.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.2
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 235; 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 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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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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