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Northwest Africa 14746
Basic information Name: Northwest Africa 14746
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14746
Observed fall: No
Year found: 2021
Country: Morocco
Mass:help 1526 g
Recommended:  Mesosiderite    [explanation]

This is 1 of 233 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 19 Mar 2022
Writeup from MB 111:

Northwest Africa 14746 (NWA 14746)


Purchased: 2021

Classification: Mesosiderite

History: Steve Arnold purchased 1526 g of the sample from a meteorite dealer in Zagora, Morocco, in Nov. 2021.

Physical characteristics: Type samples have a tabular shape and brown wind-ablated interior. The cut face shows the interior is composed of lithic and mineral clasts dispersed between oxidized patches and veins.

Petrography: Description and classification (A. Love, App) Sample is composed of: ~ 60 vol% completely oxidized FeNi metal, associated veins of FeOH minerals, ~40 vol% recrystallized lithic clasts and brecciated anhedral, low-Ca pyroxene, plagioclase, and rare olivine. Within mineral and lithic clasts: exsolved pyroxene is rare; and shows recrystallized sutured contacts with comminuted matrix materials; and olivine contains poorly-developed reaction coronas. Additional minerals are: merrillite, chromite, and calcite and lath shaped silica polymorphs.

Geochemistry: (A. Love, App) Olivine (Fa29.1-33.5, Fe/Mn=36.1-29.7, n=2); low Ca pyroxene (Fs30.0±3.4Wo3.5±0.9, Fe/Mn=24.2±3.4, n=20); pigeonite (Fs31.6Wo5.2, Fe/Mn=24.3, n=1); high Ca pyroxene (Fs17.8±1.6Wo40.5±0.8, n=3); plagioclase (An95.0±1.5Or0.1±0.1, n=8).

Classification: Mesosiderite. Based on the abundance of weathered metal, textures and compositions of silicates, this sample is a mesosiderite.

Specimens: Steve Arnold holds the main masses. A polished thin section and 3 slices totaling 20.2 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2021
Mass (g):1526
Weathering grade:high
Fayalite (mol%):29.1-33.5
Ferrosilite (mol%):30.0±3.4; 17.8±1.6
Wollastonite (mol%):3.5±0.9; 40.5±0.8
Classifier:A. Love, App
Type spec mass (g):20.2
Type spec location:App
Main mass:Steve Arnold
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. 111, in preparation (2022)
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     This is 1 of 1902 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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