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Northwest Africa 14549
Basic information Name: Northwest Africa 14549
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14549
Observed fall: No
Year found: 2021
Country: Mauritania
Mass:help 1240 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 29 Jan 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14549 (NWA 14549)

Mauritania

Purchased: 2021

Classification: Carbonaceous chondrite (CO3)

History: A single stone was found in northwest Africa by a nomad. The meteorite was eventually purchased by Carlos Muñecas (Expometeoritos) from a dealer of Morocco.

Physical characteristics: The stone has angular shape and appears to be oriented. A wind-ablated fusion crust covers ~70% of the sample. The cut face shows abundant small chondrules and metal grains.

Petrography: Description and classification (A. Love, App) The sample has a chondritic texture composed of abundant small chondrules, fragments, isolated mineral fragments and CAIs set within a semi-transparent matrix containing FeNi metal and sulfides. Chondrules have an average diameter of 243 µm (n=153). Additional minerals are: phosphates, chromite, ilmenite and pentlandite.

Geochemistry: (A. Love, App) Olivine Fa25.2±11.9 (Fa3.6-37.2), Fe/Mn=97.6±19.2, Cr2O3 in ferroan olivine=0.1±0.1 CV=47%, n=16; low-Ca pyroxene Fs3.0±1.8Wo1.6±1.1 (Fs0.9-6.2Wo0.8-3.8), n=10.

Classification: Carbonaceous chondrite (CO3 estimated subtype CO3.6, C-S1, W2) Based upon chondrule size, presence of CAIs and magnetic susceptibility, sample is a CO. Poorly-equilibrated mineral compositions, mean and CV of olivine Fa and dominant blue CL signatures (Sears et al., 1991), iron-enrichment textures (Scott and Jones, 1990) suggest sample is CO3.6.

Specimens: Carlos Muñecas (Expometeoritos) holds the main mass. A polished thin section and a 27.01 g end cut are on deposit at App.

Bibliography:
  • Scott E. R. and Jones R. H. (1990) Disentangling nebular and asteroidal features of CO3 carbonaceous chondrite meteorites. Geochim. Cosmochim. Acta 54, 2485–2502 (link)
  • Sears D. W. G., Batchelor J. D., Lu J., and Keck B. D. (1991) Metamorphism of CO and CO-like chondrites and comparisons with type 3 ordinary chondrites. Proceedings of the NIPR Symposium on Antarctic Meteorites 4, 319–343. (link)
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):1240
Pieces:1
Class:CO3
Shock stage:C-S1
Weathering grade:moderate
Fayalite (mol%):25.2±11.9
Ferrosilite (mol%):3.0±1.8
Wollastonite (mol%):1.6±1.1
Magnetic suscept.:4.00
Classifier:A. Love, App
Type spec mass (g):27.01
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
Comments:Submitted by Anthony Love
Institutions
   and collections
NIPR: Antarctic Meteorite Research Center, National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan; Website (institutional address; updated 9 Dec 2013)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 183 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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