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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
Classification
  history:
Recommended:  L7-melt breccia    [explanation]

This is 1 of 2 approved meteorites classified as L7-melt breccia.   [show all]
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
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2020 Aug
Mass (g):1855
Pieces:1
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
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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