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Northwest Africa 11867
Basic information Name: Northwest Africa 11867
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11867
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 23.4 g
Recommended:  L3-7    [explanation]

This is 1 of 3 approved meteorites classified as L3-7.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 2 Aug 2020
Writeup from MB 109:

Northwest Africa 11867 (NWA 11867)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3-7)

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

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Breccia containing multiple components in a sparse matrix containing stained metal. Isolated well-formed, unequilibrated chondrules (apparent diameter 800±340 µm, N = 21)are present, together with equilibrated Type 4 clasts, Type 5 clasts and rare Type 7 clasts (with poikiloblastic textures devoid of remnant chondrules).

Geochemistry: Olivine (Fa22.6±9.1, range Fa6.9-33.1, N = 7; Cr2O3 in all ferroan examples <0.03 wt.%), orthopyroxene (Fs5.1±3.8Wo0.4±0.2, range Fs0.8-8.0Wo0.5-0.6, N = 3), clinopyroxene (Fs2.0Wo41.9; Fs7.4Wo44.4; N = 2), olivine in Type 5 lithic clast (Fa24.9±0.1, range Fa24.8-25.1, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.73.

Classification: Ordinary chondrite (L3-7 breccia). Affinity to L chondrites is established from olivine composition in equilibrated lithic clasts and bulk magnetic susceptibility.

Specimens: The entire specimen including one polished thin section is at PSF.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):23.41
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):22.6±9.1
Ferrosilite (mol%):5.1±3.8
Wollastonite (mol%):0.4±0.2
Magnetic suscept.:4.73
Classifier:A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL
Type spec mass (g):23.41
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18014; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 7741 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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