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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
Classification
  history:
Recommended:  Mesosiderite    [explanation]

This is 1 of 202 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 21 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13639 (NWA 13639)

Morocco

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:
  MB110
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2020
Mass (g):360.9
Pieces:4
Class:Mesosiderite
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
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1556 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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