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Northwest Africa 11896
Basic information Name: Northwest Africa 11896
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11896
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 14 g
Meteoritical Bulletin:  MB 107  (2018)  Martian (polymict breccia)
Recommended:  Martian (polymict breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Martian (polymict breccia).   [show all]
Search for other: Martian meteorites
Comments: Approved 31 Aug 2018
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeup from MB 107:

Northwest Africa 11896 (NWA 11896)

(Northwest Africa)

Purchased: 2017

Classification: Martian meteorite

History: The Smithsonian specimen was purchased from Mendy Ouzillou, who had purchased it from Stefan Ralew in Ensisheim in 2017.

Physical characteristics: The type specimen has black exterior except for its saw-cut face. The saw cut exposes a gray interior that includes black spherules with sharp boundaries along the contact with the matrix and white, gray, and black clasts.

Petrography: Petrographic and microprobe examination of the polished sections show this breccia contains clasts, spherical inclusions, and mineral fragments with a wide range of textures and compositions. The fragmental minerals include orthopyroxene, pigeonite, augite, plagioclase, albitic feldspar, potassium feldspar, phosphates, and opaque oxides. The clasts include basaltic (pyroxene-plagioclase) lithic clasts, with varying mineral compositions. This meteorite is texturally similar to Northwest Africa 7034 and 7475.

Geochemistry: Mineral compositions were determined by EPMA at SI. Low-Ca pyroxene are Fs34±8Wo5±4, Fe/Mn = 35±2, n = 144. Augite are Fs24±7Wo40±4, Fe/Mn = 32±3, n = 53. Collectively, the pyroxenes in Fe-Mn composition space have linear regression slope equal to 0.0289, using the method of Papike et al. (2003) American Mineralogist 88: 469. Plagioclase Ab55±10An43±10Or2.4±0.7, n = 71, albitic feldspar Ab81±11An13±11Or5.4±3.2, n = 19, and potassium feldspar Ab20±13An2.0±1.5Or78±14, n = 18 are all present.

Classification: Martian, basaltic breccia

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2017
Mass (g):14
Class:Martian-pmict br
Classifier:N. G. Lunning, SI
Type spec mass (g):2.90
Type spec location:SI
Main mass:Ahmed El Goresy
Comments:Submitted by Nicole G. Lunning
   and collections
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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