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Northwest Africa 11988
Basic information Name: Northwest Africa 11988
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11988
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 87.6 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 11988 (NWA 11988)

(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 some discrete, well-formed chondrules (apparent diameter 660±220 µm, N = 20), together with some more recrystallized Type 5 clasts, in a matrix containing altered metal, chlorapatite and merrillite.

Geochemistry: Olivine (Fa27.8±3.9, range Fa23.1-34.2, N = 7; Cr2O3 in ferroan examples 0.06-0.14 wt.%, mean 0.08±0.03 wt.%, N = 7), orthopyroxene (Fs20.6±0.3Wo1.6±1.0, range Fs20.4-20.8Wo0.9-2.3, N = 3), clinopyroxene (Fs8.4Wo44.7; Fs10.2Wo43.6; N = 2), olivine in Type 5 lithic clast (Fa24.9±0.2, range Fa24.7-25.1, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.65.

Classification: Ordinary chondrite (L3-5 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):87.64
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):27.8±3.9
Ferrosilite (mol%):20.6±0.3
Wollastonite (mol%):1.6±1.0
Magnetic suscept.:4.65
Classifier:A. Irving and S. Kuehner, UWS; P. Carpenter
Type spec mass (g):87.64
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18028; 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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