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Northwest Africa 11962
Basic information Name: Northwest Africa 11962
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11962
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 85.8 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 107 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 23 Sep 2018
Writeup from MB 107:

Northwest Africa 11962 (NWA 11962)

(Northwest Africa)

Purchased: 2013

Classification: Lunar meteorite

History: In 2013, the NHMV acquired a single stone weighing 85.8 g from a Moroccan dealer.

Physical characteristics: The specimen is a flat and rounded individual with regmaglypts exhibiting a black shiny surface with in places dull brownish areas. A cut and polished face (3 cm2) reveals two different lithologies comprising a fine-grained, dark-gray matrix with mainly submillimeter-sized light clasts and a black compact area (1 × 0.5 cm) of impact melt.

Petrography: Clast-rich breccia containing fine-grained lithic and mineral clasts, brownish vesicular glass, and brownish to orange glass spherules. In places, the glass exhibits a flow-banded texture with dark-grey to black schlieren. Lithic clasts include basalts, gabbroic lithologies, breccia-within-breccia clasts and granophyric intergrowths of K-feldspar and silica. Mineral clasts include ortho- and clinopyroxenes (some showing exsolution lamellae), olivine, plagioclase (mostly anorthitic), silica, spinel (chromite, ulvöspinel), ilmenite, zircon, troilite and Fe,Ni metal.

Geochemistry: Olivine Fa38.0±13.5 (N = 40), plagioclase An88.2±11.2Or0.6±0.5 (N = 37), orthopyroxene Fs14.3±0.4Wo1.3±1.3 (N = 63), clinopyroxene Fs30.8±9.1Wo23.4±13.5 (N = 43), K-feldspar (An4.5±1.0Or73.9±6.4, (N = 11) BaO = 1.4-3.4 wt%), exsolved pyroxene: orthopyroxene host Fs65.5±4.8Wo4.0±1.3 (N = 19) with augite exsolution lamellae Fs33.0±2.3Wo41.6±2.3 (N = 20). The oxygen isotope composition (R. Greenwood, OU) is consistent with a lunar origin (δ17O = 3.14 per mil, δ18O = 6.03 per mil, Δ17O = 0.01 per mil).

Classification: Lunar, regolith breccia. Moderate weathering.

Specimens: A mass of 80.8 g and two thin sections are on deposit at NHMV.

Data from:
  Table 0
  Line 0:
Place of purchase:Vienna
Date:P 2013
Mass (g):85.8
Weathering grade:Moderate
Fayalite (mol%):12.0-61.1
Ferrosilite (mol%):10.7-69.9
Wollastonite (mol%):0.9-44.9
Classifier:F. Brandstätter, NHMV, and A. Bechtold, UVien
Type spec mass (g):80.8
Type spec location:NHMV
Main mass:NHMV
Comments:Submitted by F. Brandstätter
Plots: O isotopes:  
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UVien: University of Vienna, Althanstrasse 14, A1090 Vienna, Austria (institutional address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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