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Northwest Africa 13456
Basic information Name: Northwest Africa 13456
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13456
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 169 g
Classification
  history:
Recommended:  C2    [explanation]

This is 1 of 2 approved meteorites classified as C2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2)
Comments: Approved 17 Dec 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13456 (NWA 13456)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (C2)

History: The meteorite was purchased from a meteorite dealer in Guelmim, Morocco.

Physical characteristics: Almost black individual with some fusion crust.

Petrography: The meteorite displays a black interior, appears to be unbrecciated and is composed of chondrules with mean apparent diameter 150±80 µm (N=48), mineral fragments, and CAIs set into an abundant fine-grained matrix. Most components are surrounded by fine-grained dust rims and many chondrules are heavily corroded. The matrix is a network of very Fe-rich phases including abundant Fe-sulfides and fibrous phyllosilicates. Carbonates are absent.

Geochemistry: Mean values of defocused matrix analyses (beam diameter 5 µm; all wt%; N=12): SiO2: 19.4, TiO2: 0.03, Na2O: 0.24, Cr2O3: 0.20, MgO: 7.3, MnO: 0.14, CaO: 0.08, FeO: 49.7, Al2O3: 3.08, NiO: 1.41, P2O5: 0.62, S: 1.62, Total: 83.82. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ18O=0.913, 0.886, 1.678; δ17O=-3.171, -4.028, -3.953; Δ17O= -3.653, -4.496, -4.838 (all per mil).

Classification: Carbonaceous chondrite (C2). Type 2 designation due to the presence of phyllosilicates. Oxygene isotopic composition is incompatible with CM.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Guelmim, Morocco
Date:P 2019
Mass (g):169
Pieces:1
Class:C2
Shock stage:S1
Weathering grade:low
Fayalite (mol%):12.2±17.3 (0.8-58.1, n=17)
Ferrosilite (mol%):10.5±14.2 (1.1-48.0, n=16)
Wollastonite (mol%):2.5±0.9 (1.0-4.3, n=16)
Magnetic suscept.:3.48
Classifier:A. Greshake, MNB
Type spec mass (g):20.3
Type spec location:MNB
Main mass:Larbi Chnaoui
Comments:Submitted by Ansgar Greshake
Plots: O isotopes:  
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake               
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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