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Northwest Africa 13639
Basic information Name: Northwest Africa 13639
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13639
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 361 g
Recommended:  Mesosiderite    [explanation]

This is 1 of 256 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 21 Feb 2021
Writeup from MB 110:

Northwest Africa 13639 (NWA 13639)


Purchased: 2020

Classification: Mesosiderite

History: Fabien Kuntz purchased 4 fragments weighing a total of 360.9 g from a meteorite dealer in Guelmim, Morocco in 2020.

Physical characteristics: Samples are irregularly shaped and have a dark yellowish-brown oxidized exterior. A cut face shows the sample has a brecciated texture and a high abundance of sulfides.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of (vol%): cm-sized angular-rounded lithic fragments and isolated mineral grains (61) set within a matrix of FeNi metal (17) and anastomosing troilite (22). Lithic fragments are allotriomorphic, coarse-grained fragments with eucrite-like mineralogy (1.5-2 mm), and impact melt breccias with intergranular textures composed of (vol%): anhedral to subhedral olivine (11); zoned and exsolved, sieve-textured Opx (40), Cpx with ragged grain boundaries; and plag (25) mineral fragments in a melt matrix. Additional minerals are chromite, troilite, taenite, kamacite, merrillite, a Si-polymorph, and ilmenite.

Geochemistry: (A. Love, App) Olivine (Fa12.9±5.8, Fe/Mn=36.1±1.4, n=7), low-Ca pyroxene (Fs36.2±15.3Wo2.9±0.9, Fe/Mn=28.9±1.3, n=12); pigeonite (Fs53.0±5.7Wo7.0±1.2, Fe/Mn=28.5±2.4 n=8); high-Ca pyroxene (Fs30.0±2.3Wo39.9±1.9, Fe/Mn=30.3±1.6, n=11). plagioclase (An94.7±1.3Or0.0±0.1, n=8).

Classification: Mesosiderite (estimated class A4). Based on abundance of FeNi metal, modal mineralogy and mineral compositions this is a type A mesosiderite. Based on textures of clasts, this is an impact melt (type 4).

Specimens: Fabien Kuntz holds the main masses. An endcut weighing 20.75 g and a polished mount are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2020
Mass (g):360.9
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):12.9±5.8
Ferrosilite (mol%):36.2±15.3; 53.0±5.7; 30.0±2.3
Wollastonite (mol%):2.9±0.9; 7.0±1.2; 39.9±1.9
Magnetic suscept.:5.36
Classifier:A. Love, App
Type spec mass (g):28.73
Type spec location:App
Main mass:Fabien Kuntz
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz: Fabien Kuntz, France; Website (private address)
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
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   


     This is 1 of 1991 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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