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Northwest Africa 11055
Basic information Name: Northwest Africa 11055
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11055
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 240 g
Meteoritical Bulletin:  MB 106  (2018)  Diogenite-pm
Recommended:  Diogenite-pm    [explanation]

This is 1 of 60 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 14 Feb 2017
Writeup from MB 106:

Northwest Africa 11055 (NWA 11055)

(Northwest Africa)

Purchased: 2016 Jun

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Fabien Kuntz in June 2016 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of angular clasts of diogenitic orthopyroxene and anorthite (~10 vol.%) together with sparse lithic diogenite clasts and <10 vol.% eucrite debris. Diogenite clasts contain variable amounts of plagioclase, and range from orthopyroxenitic to feldspathic to noritic. Orthopyroxene exhibits several different compositions and some grains have more magnesian cores. Accessory minerals are silica polymorph, exsolved pigeonite, bytownite, ilmenite (containing rare zircon inclusions), chromite, troilite and minor barite.

Geochemistry: Diogenitic orthopyroxene (Fs22.4Wo2.0; Fs31.4Wo4.7; FeO/MnO = 26-27, N = 2), orthopyroxene host (Fs50.8Wo3.3, FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs25.5-26.7Wo39.2-38.7, FeO/MnO = 28-29, N = 2), olivine (Fa62.1, FeO/MnO = 45), plagioclase (An88.6Or0.4; An94.7Or0.2).

Classification: Diogenite (polymict breccia, feldspathic).

Specimens: 23.2 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2016 Jun
Mass (g):240
Shock stage:low
Weathering grade:low
Fayalite (mol%):62.1
Ferrosilite (mol%):22.4; 31.4; 50.8; 25.5-26.7
Wollastonite (mol%):2.0; 4.7; 3.3; 39.2-38.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.2
Type spec location:PSF
Main mass:F. Kuntz
Comments:K312; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; 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 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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