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Northwest Africa 11508
Basic information Name: Northwest Africa 11508
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11508
Observed fall: No
Year found: 2017
Country: Algeria
Mass:help 302 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 383 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Dec 2017
Writeup from MB 106:

Northwest Africa 11508 (NWA 11508)


Purchased: 2017 Jun

Classification: HED achondrite (Eucrite, polymict)

History: Purportedly found near the Algeria/Libya border and purchased by Darryl Pitt in June 2017 from a dealer in Mauritania.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting mainly of fairly coarse grained eucritic debris with minor diogenitic orthopyroxene plus some vitrophyric eucrite clasts and eucritic breccia clasts. Other minerals are exsolved pigeonite, calcic plagioclase, ferroan pigeonite, silica polymorph, fayalite, ilmenite, Ti-free chromite, troilite and Ni-free metal.

Geochemistry: Orthopyroxene host (Fs57.3Wo4.0, FeO/MnO = 33), clinopyroxene exsolution lamella (Fs27.3Wo40.2, FeO/MnO = 31), diogenitic orthopyroxene (Fs21.2Wo1.3; Fs30.7Wo4.5; FeO/MnO = 27-30; N = 2), ferroan pigeonite (Fs51.4Wo22.0; Fs74.7Wo14.3; FeO/MnO 21-32; N = 2), fayalite (Fa77.3, FeO/MnO = 45), plagioclase (An85.0-86.0Or0.4, N = 2).

Classification: Eucrite (polymict breccia).

Specimens: 20.1 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Jun
Mass (g):302.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):77.3
Ferrosilite (mol%):57.3; 27.3; 21.1; 30.7; 51.4; 74.7
Wollastonite (mol%):4.0; 40.2; 1.3; 4.5; 22.0; 14.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 295; 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 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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