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Northwest Africa 14198
Basic information Name: Northwest Africa 14198
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14198
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 703 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 14198 (NWA 14198)

Tindouf, Algeria

Purchased: 2021

Classification: Mesosiderite

History: (F. Kuntz) Four weathered samples were purchased by Fabien Kuntz from a dealer in Tindouf, Algeria, in May 2021.

Physical characteristics: The samples are dark brown, irregularly shaped, and have a wind-ablated, weathered exterior. The interior is a breccia of oxidized metal grains and silicates crosscut by abundant veins of oxidized Fe minerals.

Petrography: Description and classification (A. Love, App): Sample is composed of: completely oxidized FeNi metal; associated veins of FeOH minerals; lithic and mineral clasts with brecciated anhedral, weakly-zoned, low-Ca pyroxene, plagioclase, rare olivine (~1 vol%) and lithic clasts with similar mineralogy. Within clasts: cataclastic texture is recognizable and contains poorly recrystallized contacts with smaller comminuted matrix; and olivine (<1 vol%) contains poorly-developed reaction coronas. Additional minerals are: merrillite, chromite, rare ilmenite and troilite; and both equant and lath shaped silica polymorphs and troilite.

Geochemistry: (A. Love, App) Olivine (Fa38.1±3.1, Fe/Mn=39.1±2.0, n=3); low Ca pyroxene (Fs30.6±4.4Wo3.5±0.8, Fe/Mn=23.4±3.7, n=24); high Ca pyroxene (Fs18.4±1.7Wo40.1±0.3, Fe/Mn=18.9±0.9, n=3); plagioclase (An94.0±1.2Or0.1±0.1, n=8)

Classification: Mesosiderite (estimated class A2). Mesosiderite based on ubiquitous oxidized metal and brecciated texture of silicates. Class A based on modal abundance of silicates (24 vol% plagioclase, 66 vol% Opx). Metamorphic type 2 based on poorly recrystallized cataclastic texture and reaction coronas around olivine.

Specimens: F. Kuntz holds the main mass. A polished mount and an endcut weighing 38g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):703.1
Weathering grade:moderate
Fayalite (mol%):38.1±3.1
Ferrosilite (mol%):30.6±4.4; 18.4±1.7
Wollastonite (mol%):3.5±0.8; 40.1±0.3
Classifier:Anthony Love
Type spec mass (g):38
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)
Find references in NASA ADS:
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     This is 1 of 50 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 1213 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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