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Northwest Africa 10954
Basic information Name: Northwest Africa 10954
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10954
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 14.06 kg
Meteoritical Bulletin:  MB 106  (2018)  L4
Recommended:  L4    [explanation]

This is 1 of 2073 approved meteorites (plus 5 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Mar 2017
Writeup from MB 106:

Northwest Africa 10954 (NWA 10954)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L4)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005 and subsequently acquired by the Hollis Collection.

Physical characteristics: (P.Sipiera, PSF) Rounded "6 sided" individual stone (14056 g) with approximate dimensions of 17 cm by 18 cm by 26 cm. The chocolate-brown exterior has a rough appearance caused by uniformly distributed small bumps, but lacks any "thumb-print" features. The fresh interior is dark gray with relatively abundant bright metal grains and small round chondrules.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen. Well-formed chondrules (apparent diameter 300±200 µm) are set in a relatively coarse grained matrix containing unaltered metal.

Geochemistry: Olivine (Fa21.3-22.1, N = 3), orthopyroxene (Fs18.1-18.3Wo1.3-1.1, N = 3), clinopyroxene (Fs6.3-8.5Wo44.9-44.5, N = 2). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, δ17O 3.071, 3.399, 2.868; δ18O 4.009, 4.663, 3.485; Δ17O 0.954, 0.937, 1.024 per mil. Magnetic susceptibility log χ (× 10-9 m3/kg) =4.81.

Classification: Ordinary chondrite (L4, highly shocked).

Specimens: 189 g including one polished thin section at PSF; remainder in the Hollis Collection.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):14056
Shock stage:S4
Weathering grade:W0
Fayalite (mol%):21.3-22.1
Ferrosilite (mol%):18.1-18.3
Wollastonite (mol%):1.3-1.1
Magnetic suscept.:4.81
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):189
Type spec location:PSF
Main mass:Hollis Collection
Comments:CHCS105; submitted by A. Irving
Plots: O isotopes:  
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 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)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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