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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 181 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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 146 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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