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Northwest Africa 8123
Basic information Name: Northwest Africa 8123
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8123
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 177.5 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  H(L)3.1
Recommended:  H(L)3.1    [explanation]

This is the only approved meteorite classified as H(L)3.1.
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 18 Dec 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8123 (NWA 8123)

(Northwest Africa)

Purchased: 2013 Feb

Classification: H(L)3.1

History: Purchased by Sergey Vasiliev and Marc Jost in February 2013 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed glass-bearing chondrules are set in a heavily stained, metal-bearing matrix.

Geochemistry: Olivine (Fa0.3-97.1, N = 14; Cr2O3 in ferroan examples is 0.12-0.65 wt.%, mean 0.32±0.25 wt.%, N = 12), orthopyroxene (Fs2.0-12.7Wo0.5-3.8, N = 3), subcalcic augite (Fs4.7-24.0Wo35.4-32.8). Oxygen isotopes (K. Ziegler, UNM): analyses by laser fluorination of acid-washed subsamples gave, respectively δ17O 2.883, 2.644, 2.289; δ18O 4.494, 3.478, 3.942; Δ17O 0.510, 0.808, 0.208 per mil (for a TFL slope of 0.528). Magnetic susceptibility, log χ (× 10-9 m3/kg) = 4.02.

Classification: Ordinary chondrite H(L)3.1. The wide range in olivine compositions and the distribution of Cr2O3 in ferroan olivine establish this specimen as a highly unequilibrated ordinary chondrite of Type 3.1, based on the scheme of Grossman and Brearley (2005). The relatively small average chondrule size and oxygen isotopes appear to establish affinity with H chondrites (despite some scatter in results for acid-washed subsamples of this relatively weathered specimen), but magnetic susceptibility is too low.

Specimens: 24.7 g including one polished thin section at UWB. The remainder is held jointly by Mr. S. Vasiliev and Mr. M. Jost.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2013 Feb
Mass (g):177.5
Pieces:1
Class:H(L)3.1
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):0.3-97.1 (N=14)
Ferrosilite (mol%):2.0-12.7 (N=3)
Wollastonite (mol%):0.5-3.8
Magnetic suscept.:4.02
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):24.7
Type spec location:UWB
Main mass:S. Vasiliev & M. Jost
Comments:SVMJ06; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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