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Northwest Africa 14518
Basic information Name: Northwest Africa 14518
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14518
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 3.1 kg
Classification
  history:
Recommended:  Mesosiderite-A3    [explanation]

This is 1 of 7 approved meteorites classified as Mesosiderite-A3.   [show all]
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 15 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14518 (NWA 14518)

(Northwest Africa)

Purchased: 2021

Classification: Mesosiderite (group A3)

History: Purchased from a Moroccan meteorite dealer in 2021.

Physical characteristics: Single object with irregular, dark gray-brown exterior. Saw cut reveals numerous irregular metal domains >1 mm, but also abundant fine-grained metal, distributed uniformly throughout a silicate groundmass.

Petrography: (A. Ross and C. Agee, UNM) Microprobe examination of a polished mount shows pyroxene making up approximately 75% of the silicate portion of this meteorite, ~25% plagioclase, with ~5% minor phases silica, ilmenite, merrillite, chromite, rutile, and troilite. Some pyroxene grains have exsolution lamellae. Plagioclase is often poikilitically enclosed in larger pyroxene grains; no was olivine detected. Metal makes up approximately 35% of this meteorite and is primarily segregated into irregular ameboid domains >1 mm, although there are scattered smaller (~10 ?m) grains throughout the silicate domains. Both kamacite and taenite are present. No brecciation observed.

Geochemistry: (A. Ross, UNM) Low-Ca pyroxene Fs31.5±1.3Wo4.3±0.51, Fe/Mn=26±1, n=4; high-Ca pyroxene Fs17.7±0.9Wo37.4±1.6, Fe/Mn=23±1, n=3; plagioclase An88.4±2.0Ab11.0±1.9Or0.6±0.2, n=6; kamacite Fe=93.7±0.2, Ni=6.5±0.2, Co=0.49±0.02 (wt%), n=3; taenite Fe=49.2±2.5, Ni=50.4±2.2, Co=0.07±0.02 (wt%), n=3

Classification: Mesosiderite-A3. Relatively high abundance of plagioclase and silica consistent with group A. Segregated metal, presence of some texturally and chemically equilibrated silicates, and absence of significant brecciation consistent with type 3.

Specimens: 47.1 g on deposit at UNM, Craig Zlimen and Brett Joseph Cohen hold the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):3.1 kg
Pieces:1
Class:Mesosiderite (group A3)
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):31.5±1.3, 17.7±0.9
Wollastonite (mol%):4.3±0.5, 37.4±1.6
Classifier:C. Agee, UNM
Type spec mass (g):47.1
Type spec location:UNM
Main mass:Craig Zlimen and Brett Joseph Cohen
Comments:Field name ZLI-038; submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Robert Smart      
Public domain photographs:
Carl Agee               
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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