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Northwest Africa 13959
Basic information Name: Northwest Africa 13959
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13959
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1855 g
Recommended:  L7-melt breccia    [explanation]

This is the only approved meteorite classified as L7-melt breccia.
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 29 May 2021
Writeup from MB 110:

Northwest Africa 13959 (NWA 13959)

(Northwest Africa)

Purchased: 2020 Aug

Classification: L7-melt breccia

History: Purchased by Ziyao Wang in August 2020 from a dealer in Guelmim, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of clasts within a glassy matrix (dark taupe-colored in thin section) containing entrained crystalline debris. The clasts lack chondrules but do not have a triple grain junction texture, and instead have a granular texture with interstitial dark glass. Accessory phases are sodic plagioclase, kamacite, troilite and pentlandite.

Geochemistry: Olivine (Fa23.7±0.9, range Fa22.3-25.0, N = 6), low-Ca pyroxene (Fs20.0±0.8Wo2.6±0.5, range Fs18.7-20.5Wo2.1-3.2, N = 4), subcalcic augite (Fs15.4Wo27.4), augite (Fs11.8±0.7Wo35.9±2.1, range Fs11.3-12.3Wo34.4-37.3, N = 2).

Classification: Ordinary chondrite (L7 melt breccia). There are no recognizable remnant chondrules, yet this specimen does not have poikiloblastic or triple grain junction textures.

Specimens: 25.7 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2020 Aug
Mass (g):1855
Class:L7-melt breccia
Shock stage:S6
Weathering grade:W0/1
Fayalite (mol%):23.7±0.9
Ferrosilite (mol%):20.0±0.8
Wollastonite (mol%):2.6±0.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.7
Type spec location:UWB
Main mass:WangZ
Comments:Work name WZY-04; 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)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang            

     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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