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Northwest Africa 14546
Basic information Name: Northwest Africa 14546
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14546
Observed fall: No
Year found: 2021
Country: Mauritania
Mass:help 3 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  CK5
Recommended:  CK5    [explanation]

This is 1 of 215 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 12 Feb 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14546 (NWA 14546)

Mauritania

Purchased: 2021

Classification: Carbonaceous chondrite (CK5)

History: Carlos Muñecas (Expometeoritos) purchased the 3000 g sample from a dealer in Mauritania in 2020.

Physical characteristics: Sample has a dark-brown exterior with visible chondrules on the surface. The cut face shows the interior has a chondritic texture with abundant chondrules separated by oxidized veinlets.

Petrography: Description and classification (A. Love, App) Sample has a chondritic texture composed of dispersed (~60 vol%) chondrules, fragments and a large (10 mm long) CAI set within a recrystallized matrix. Average apparent diameter of chondrules is 671 µm, n=32. Secondary plagioclase has an average long dimension of 75 µm (n=100) Additional minerals are: Cr-bearing magnetite, chromite, ilmenite, phosphates, pentlandite, and FeS.

Geochemistry: (A. Love, App) Olivine (Fa28.3±0.2, Fe/Mn=83.3±4.3, NiO=0.4±0.1, n=14); aluminous low Ca pyroxene (Fs26.2±1.5Wo2.3±2.8, Al2O3=3.3±1.2 n=10); aluminous high Ca pyroxene (Fs11.8±2.4Wo41.3±8.6, Al2O3=2.7±0.6, n=5). Cr2O3 wt% in magnetite=2.62±0.23, n=6.

Classification: Carbonaceous chondrite (CK5, C-S3, wi-2). Based on texture, chondrule diameters, equilibrated mineral compositions, Cr-bearing magnetite and Ni-bearing olivine, Torrano et al. (2020); this sample is a CK5.

Specimens: Carlos Muñecas holds the main mass. A slice weighing 22.67 g and a polished thin section are on deposit at App.

Bibliography:
  • Torrano Z. A., Davidson J. and Wadhwa M. (2020) A reclassification of Northwest Africa 2900 from CV3 to CK3 chondrite. Meteorit. Planet. Sci. 55, 2539–2550. (link)
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):3000
Pieces:1
Class:CK5
Shock stage:C-S3
Weathering grade:wi-2
Fayalite (mol%):28.3±0.2
Ferrosilite (mol%):26.2±1.5; 11.8±2.4
Wollastonite (mol%):2.3±2.8; 41.3±8.6
Magnetic suscept.:4.68
Classifier:A. Love, App
Type spec mass (g):22.67
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
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)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos:
CreditPhotos
Public domain photographs:
Anthony Love   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 220 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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Revision
  history:
  This lists important revisions made to data for this record.

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