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Northwest Africa 13167
Basic information Name: Northwest Africa 13167
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13167
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1027 g
Classification
  history:
Recommended:  C2-ung    [explanation]

This is 1 of 23 approved meteorites classified as C2-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and Ungrouped chondrites
Comments: Approved 1 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13167 (NWA 13167)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (C2, ungrouped)

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

Physical characteristics: Five black individuals partly covered with fusion crust.

Petrography: The meteorite a brecciated matrix-dominated carbonaceous chondrite with chondrules (mean diameter about 300 μm), mineral fragments, and few CAIs. Most of the components are surrounded by fine-grained dust rims. The matrix is highly porous and composed of Ca-carbonates, phyllosilicates with fibrous and flaky appearance, and Fe-sulfides. Some FeNi metal grains are present mostly as inclusions in forsteritic olivine.

Geochemistry: Mean values of defocused matrix analyses (beam diamter 10 µm; all wt%; N=25): SiO2: 24.1, TiO2: 0.03, Na2O: 0.46, Cr2O3: 0.29, MgO: 13.9, MnO: 0.16, FeO: 31.2, Al2O3: 2.50, NiO: 2.10, P2O5: 0.34, S: 4.6, Total: 79.69; Oxygen isotopes (K. Ziegler, UNM): 6 acid-washed fragments analyzed by laser fluorination gave: δ18O=-6.769, -2.952, -1.991, 1.322, -2.345, -3.978; δ17O=-10.566, -7.481, -6.795, -4.079, -6.747, -8.036; Δ17O= -6.992, -5.922, -5.744, -4.777, -5.509, -5.936 (all per mil)

Classification: C2 due to petrography and presense of pyhllosilicates and carbonates. Ungrouped according to oxygen isotopic composition which is incompatible with CM.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):1027
Pieces:5
Class:C2-ung
Shock stage:S1
Weathering grade:low
Fayalite (mol%):21.5±21.3 (1.4-54.4, n=15)
Ferrosilite (mol%):0.7±0.2 (0.5-0.9, n=14)
Wollastonite (mol%):0.9±0.1 (0.8-1.0, n=14)
Magnetic suscept.:4.17
Classifier:A. Greshake, MNB
Type spec mass (g):20.2
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
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 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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