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Northwest Africa 13684
Basic information Name: Northwest Africa 13684
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13684
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 170 g
Classification
  history:
Recommended:  CK5    [explanation]

This is 1 of 199 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 13 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13684 (NWA 13684)

Mauritania

Purchased: 2020

Classification: Carbonaceous chondrite (CK5)

History: Carlos Muñecas purchased the 170 g sample from a dealer in Mauritania in 2020.

Physical characteristics: The sample is ovoid and has a dark brown-black exterior with protruding chondrules. The interior is dark brown and contains dispersed chondrules.

Petrography: Description and classification (A. Love, App) Sample has a chondritic texture composed of dispersed chondrules, fragments and magnetite. Average apparent diameter of chondrules is 636µm, n=51. Additional minerals are: magnetite, chromite, ilmenite, phosphates, pentlandite, FeS.

Geochemistry: Olivine (Fa33.4±0.7, Fe/Mn=111.4±7.7, NiO=0.4±0.1, n=20); low Ca pyroxene (Fs27.6±0.6Wo2.7±1.9, Fe/Mn=71.6±3.6, n=5); high Ca pyroxene (Fs15.3±1.5Wo49.1±0.7, n=4), plagioclase (An51.4±9.6Or1.8±0.7, n=5). Cr2O3 Wt% in magnetite=3.1±1.3.

Classification: Carbonaceous chondrite (CK5, wi-3). Based on chondrule diameters, equilibrated mineral compositions, plagioclase composition, Cr-bearing magnetite and Ni-bearing olivine (Torrano et al., 2020) , this sample is a CK5.

Specimens: Carlos Muñecas holds the main mass. An endcut and 2 slices weighing 20.91 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:
  MB110
  Table 0
  Line 0:
Date:P 2020
Mass (g):170
Pieces:1
Class:CK5
Shock stage:low
Weathering grade:wi-3
Fayalite (mol%):33.4±0.7
Ferrosilite (mol%):27.5±0.2; 15.3±1.5
Wollastonite (mol%):1.6±1.5; 49.1±0.7
Magnetic suscept.:4.68
Classifier:A. Love, App
Type spec mass (g):20.91
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., 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
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love         
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 186 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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