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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
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 270 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 31 Oct 2021
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
State/Prov/County:Guelmim
Place of purchase:Morocco
Date:P 2021
Mass (g):72
Pieces:3
Class:Mesosiderite
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
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 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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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2 approved meteorites from Guelmim, Morocco
     This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)
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Revision
  history:
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