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Northwest Africa 11983
Basic information Name: Northwest Africa 11983
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11983
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 193.1 g
Recommended:  L3-6    [explanation]

This is 1 of 61 approved meteorites classified as L3-6.   [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 11983 (NWA 11983)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3-6)

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 composed of multiple components in a sparse matrix containing stained metal, chlorapatite and merrillite. Isolated well-formed, unequilibrated chondrules (apparent diameter 860±520 µm, N = 22) are present, together with some much more recrystallized Type 5 and Type 6 clasts, set in a sparse matrix containing chlorapatite and merrillite.

Geochemistry: Olivine (Fa24.2±7.5, range Fa9.3-34.6, N = 7; Cr2O3 in ferroan examples 0.02-0.07 wt.%, mean 0.04±0.02 wt.%, N = 6), orthopyroxene (Fs11.7±13.0Wo1.0±1.0, range Fs2.5-20.9Wo0.3-1.7, N = 2), clinopyroxene (Fs7.2Wo45.9; Fs8.1Wo44.5; N = 2), olivine in Type 6 lithic clast (Fa 25.0±0.1, range Fa24.9-25.0, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.73.

Classification: Ordinary chondrite (L3-6 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):193.1
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):24.2±7.5
Ferrosilite (mol%):11.7±13.0
Wollastonite (mol%):1.0±1.0
Classifier:A. Irving and S. Kuehner, UWS; P. Carpenter
Type spec mass (g):193.1
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18023; 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 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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