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Northwest Africa 13565
Basic information Name: Northwest Africa 13565
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13565
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 1085 g
Recommended:  Mesosiderite    [explanation]

This is 1 of 221 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 5 Dec 2020
Writeup from MB 109:

Northwest Africa 13565 (NWA 13565)


Purchased: 2020

Classification: Mesosiderite

History: Carlos Muñecas (Expometeoritos) purchased the sample from a dealer in Mauritania in 2020.

Physical characteristics: The sample is dark in color, has a rounded-irregular shape, and has a metallic exterior. The cut face shows a metal-rich breccia containing dispersed silicate clasts within a host of interconnected metal grains.

Petrography: Description and Classification (A. Love, App): Sample is a breccia composed of (vol%): cm-sized, angular-irregular-shaped lithic and mineral clasts (~35) set within a network of irregularly shaped, mm-sized metal grains (~65). Lithic clasts have fine-grained (avg. grain size 0.5 mm), brecciated textures. Modal percentages (vol%) of silicates: orthopyroxene (69), plagioclase (25), olivine (2) and an irregular-lath-shaped silica polymorph (4). Some matrix pyroxenes are inverted and show blebby and lamellar exsolution. Olivine show thin reaction coronas. Plagioclase occurs as rounded grains and Si-polymorph occurs as angular grains. Brecciated texture is still visible and many fine-grained areas have an average grainsize <50 µm. Grain boundaries between silicates show some sutured textures. Additional minerals are: kamacite, taenite, lath-shaped Si polymorph, apatite, troilite, chromite, trace ilmenite.

Geochemistry: (A. Love, App) Olivine (Fa24.6-31.0, Fe/Mn=39.5-35.4, n=2), zoned low-Ca pyroxene (Fs31.8±7.2Wo3.9±2.8, Fe/Mn=25.5±2.6, n=7); pigeonite (Fs48.5Wo10.5, n=1); high-Ca pyroxene (Fs17.0Wo41.3, n=1). plagioclase (An94.3±2.5Or0.6±0.1, n=5).

Classification: Mesosiderite (estimated class A2). Mesosiderite Class A based on texture, metal abundance, magnetic susceptibility and modal silicate abundance of plagioclase and Opx. Metamorphic class 2 based on thin reaction coronas, fine-grained comminuted regions between clasts, lack of significant recrystallization textures of silicates and presence of pigeonite.

Specimens: Carlos Muñecas (Expometeoritos) holds the main mass. A slice weighing 24.5 g and a polished mount are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020
Mass (g):1085
Shock stage:low
Weathering grade:low
Fayalite (mol%):24.6-31.0
Ferrosilite (mol%):31.8±7.2; 48.5; 17.0
Wollastonite (mol%):3.9±2.8; 10.5; 41.3
Magnetic suscept.:6.13
Classifier:A. Love, App
Type spec mass (g):24.5
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
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)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 149 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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