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Northwest Africa 11524
Basic information Name: Northwest Africa 11524
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11524
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 820 g
Meteoritical Bulletin:  MB 106  (2018)  Lunar (Bas. Breccia)
Recommended:  Lunar (Bas. Breccia)    [explanation]

This is 1 of 21 approved meteorites classified as Lunar (Bas. Breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 6 Dec 2017
Writeup from MB 106:

Northwest Africa 11524 (NWA 11524)

(Northwest Africa)

Purchased: 2017

Classification: Lunar meteorite (basaltic breccia)

History: Purchased in June 2017 from Aziz Habibi in Erfoud, Morocco

Physical characteristics: Single stone consisting of approximately 50% green-brown, fine-grained basalt and 50% brecciated clasts of distinct basaltic lithologies set in a fine grained darker matrix. Contact between the basalt and the breccia is very sharp with markedly different fusion crust textures. The strikingly different rock textures on either side of the sharp contact give the appearance of two different meteorites fused together.

Petrography: (C. Agee, UNM) Microprobe examination was performed on polished slabs of both the basalt and breccia portions of the meteorite. The basalt portion consists of prismatic to acicular pigeonite and augite (50%), plumose plagioclase (25-35%), ubiquitous ilmenite (5-10%), and minor Fe-sulfide and Fe-metal. A significant shock melt vein was observed in the basalt portion. The composition and textures of the silicates and abundance of ilmenite in the basalt portion is typical of pyroxene-phyric, lunar mare basalt, hereafter Mare Basalt Lithology (MBL). The breccia consists of four distinct basalt lithologies (L1-L4) set in a fine-grained mix of pyroxene, plagioclase, and opaque fragments. L1 is an olivine-pigeonite basalt. L2 is an augite-pigeonite basalt with a strong pyroxene iron-enrichment trend. L3 is an olivine-pigeonite-augite basalt with a strong pyroxene iron-enrichment trend. L4 is an olivine-augite-pigeonite basalt with well-defined compositional separation between pigeonite and augite.

Geochemistry: (C. Agee, UNM) MBL: pigeonite Fs28.3±1.3Wo10.8±4.7, Fe/Mn=56±6, n=10; augite Fs24.1±1.5Wo31.5±3.5, Fe/Mn=56±6, TiO2=1.2±0.2, Cr2O3=1.2±0.2, Al2O3=3.4±0.4 (all wt%), n=4; ilmenite TiO2=52.4±0.6, FeO=46.3±0.3 (all wt%), Fe/Mn=146±11; plagioclase An86.9±1.3Ab12.4±1.2Or0.7±0.6, n=7. Shock melt vein (proxy for bulk composition) SiO2=45.7±1.1, TiO2=3.2±0.6, Cr2O3=0.4±0.2, Al2O3=11.1±2.9, MgO=6.9±1.9, FeO=18.9±1.1, MnO=0.25±0.02, CaO=11.3±0.5, NiO=0.02±0.01, Na2O=0.36±0.14, K2O=0.19±0.10 (all wt%), n=4. L1: olivine Fa30.2±0.1; Fe/Mn=92±7; pigeonite Fs22.6±2.4Wo15.2±5.4, Fe/Mn=50±2, n=4; plagioclase An87.9±0.9Ab10.1±0.3Or1.9±0.6, n=3. L2: pigeonite Fs42.7±10.7Wo15.4±4.6, Fe/Mn=60±10, n=7; augite Fs38.5±24.5Wo29.1±4.2, Fe/Mn=58±11, n=3; plagioclase An93.6±1.4Ab6.2±1.4Or0.3±0.1, n=4. L3: olivine Fa39.4±6.4; Fe/Mn=96±6; pigeonite Fs34.4±12.3Wo12.8±2.6, Fe/Mn=58±5, n=2; augite Fs41.7±13.8Wo27.9±4.0, Fe/Mn=64±9, n=8; plagioclase An92.9±1.9Ab6.5±1.5Or0.6±0.4, n=4. L4: olivine Fa36.4±1.3; Fe/Mn=97±8; pigeonite Fs25.8±1.7Wo13.8±3.7, Fe/Mn=53±4, n=2; augite Fs16.2±0.6Wo34.0±2.9, Fe/Mn=47±9, n=7; plagioclase An89.2±2.8Ab9.7±2.5Or1.1±0.3, n=4.

Classification: Lunar, Basalt Breccia

Specimens: 25.1 g on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):820
Class:Lunar (Bas. Breccia)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):28.3±1.3, 24.1±1.5
Wollastonite (mol%):10.8±4.7, 31.5±3.5
Classifier:C. Agee, UNM
Type spec mass (g):25.1
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MVCH272; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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