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Northwest Africa 10404
Basic information Name: Northwest Africa 10404
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10404
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 229 g
Meteoritical Bulletin:  MB 104  (2015)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 280 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Dec 2015
Writeup from MB 104:

Northwest Africa 10404 (NWA 10404)

(Northwest Africa)

Purchased: 2015 May

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Darryl Pitt in May 2015 from a dealer in Ouarzazate, Morocco.

Physical characteristics: A single stone (229 g) lacking fusion crust. Interior slices exhibit angular mineral clasts plus rounded colorless, brownish and greenish glassy objects in gray, partly vesicular matrix

Petrography: (A. Irving and S. Kuehner, UWS) Vitric fragmental breccia composed of angular to rounded lithic clasts plus mineral clasts of anorthite, olivine, pigeonite, orthopyroxene, subcalcic augite, augite and rare Ti-chromite, troilite and taenite in a partly vitreous matrix. Some lithic clasts are fine grained, plagioclase-phyric crystalline lithologies, but many consist of partly-devitifried glass with bulk compositions intermediate between those of anorthite, olivine and low-Ca pyroxene. The latter consist of isotropic cores (colorless to pale brown in thin section) mantled by aggregates rich in polycrystalline, spherulitic birefringent crystallites within zones parallel to clast margins and constituting ~50% of clast volumes.

Geochemistry: Olivine (Fa26.4; Fa47.2, FeO/MnO = 77-84, N = 2), orthopyroxene (Fs37.6Wo3.2, FeO/MnO = 64), pigeonite (Fs21.1-25.9Wo15.5-11.3, FeO/MnO = 59-60, N = 2), subcalcic augite (Fs21.9Wo32.2, FeO/MnO = 51), augite (Fs20.0Wo37.9, FeO/MnO = 46), plagioclase (An96.1-97.0Or0.0, N = 3). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave the following mean abundances (in wt.%) FeO 3.8, Na2O 0.36; (in ppm) Sc 6.8, La 4.2, Sm 2.0, Eu 0.83, Yb 1.5, Lu 0.21, Th 0.74.

Classification: Lunar (feldspathic vitric regolithic breccia).

Specimens: 20.61 g including one polished thin section at UWB; main mass with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2015 May
Mass (g):229
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):26.4-47.2
Ferrosilite (mol%):37.6; 21.1-25.9; 21.9; 20.0
Wollastonite (mol%):3.2; 15.5-11.3; 32.2; 37.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.61
Type spec location:UWB
Main mass:DPitt
Comments:MAC 140; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
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 Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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