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Northwest Africa 14199
Basic information Name: Northwest Africa 14199
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14199
Observed fall: No
Year found: 2021
Country: Morocco
Mass:help 72 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 31 Oct 2021
Writeup from MB 110:

Northwest Africa 14199 (NWA 14199)

Guelmim, Morocco

Purchased: 2021

Classification: Mesosiderite

History: (F. Kuntz) Three samples were purchased by Fabien Kuntz from a dealer in Guelmim, Morocco in April of 2021.

Physical characteristics: The sample is dark brown and is irregularly shaped, with metal grains protruding through the exterior. The sample has a wind-ablated exterior however, it shows a rollover lip with bubbling on the trailing edge. A small portion of fusion crust is visible in back-scattered electron images. The interior is a breccia of metal grains and silicates.

Petrography: Description and classification (A. Love, App) Sample is recrystallized breccia composed of (vol%): rounded-irregular masses of FeNi metal (50) up to 7 mm and anhedral silicates (50) which show sutured grain boundaries and avg. grain size of 372 µm (n=64). Pyroxenes and plagioclase both show poikiloblastic textures and olivine (<1 vol%) contains well-developed reaction coronas. Additional minerals are: merrillite, ilmenite, chromite, troilite, rutile, schreibersite and both equant and lath shaped silica polymorphs.

Geochemistry: (A. Love, App) Olivine (core Fa27, rim Fa16, Fe/Mn=17.5, n=1); low Ca pyroxene (Fs32.0±3.8Wo3.1±0.8, Fe/Mn=23.4±2.9, n=20); high Ca pyroxene (Fs16.2±1.4Wo41.1±0.9, Fe/Mn=18.2±1.6, n=11); plagioclase (An95.2±1.4Or0.3±0.1, n=8).

Classification: Mesosiderite (estimated class A3). Mesosiderite based on abundance of metal and textures of silicates. Class A based on modal abundance of silicates (32 vol% plagioclase, 61 vol% Opx). Metamorphic type 3 based on recrystallized texture with sutured grain boundaries, absence of fine-grained regions and well-developed reaction coronas around olivine.

Specimens: F. Kuntz holds the main mass. A polished mount and an endcut weighing 15.7 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):72
Weathering grade:low
Fayalite (mol%):21.3
Ferrosilite (mol%):32.0±3.8; 16.2±1.4
Wollastonite (mol%):3.1±0.8; 41.1±0.9
Magnetic suscept.:5.65
Classifier:A. Love, App
Type spec mass (g):15.7
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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 2 approved meteorites from Guelmim, Morocco
     This is 1 of 1894 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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