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Northwest Africa 7158
Basic information Name: Northwest Africa 7158
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7158
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 230 g
Meteoritical Bulletin:  MB 104  (2015)  LL3
Recommended:  LL3    [explanation]

This is 1 of 414 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 17 Nov 2015
Writeup from MB 104:

Northwest Africa 7158 (NWA 7158)

(Northwest Africa)

Purchased: 2011

Classification: Ordinary chondrite (LL3)

History: Purchased by Marcin Cimała in 2011 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed chondrules (mean apparent diameter 1.2 mm) in a finer matrix.

Geochemistry: Olivine (Fa0.9-74.1, Cr2O3 in ferroan examples 0.09-0.23 wt.%, mean 0.14±0.05 wt.%, N = 8), orthopyroxene (Fs2.1-14.5Wo0.2-1.7, N = 3), subcalcic augite (Fs17.7Wo25.6), augite (Fs0.9-2.6Wo44.5-47.9, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.91.

Classification: Ordinary chondrite (LL3). LL group designation based on magnetic susceptibility.

Specimens: 20.2 g including one polished thin section at PSF; main mass with Mr. M. Cimała.

Writeup from MB 110:
Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2011
Mass (g):230
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):0.9-74.1 (N = 8)
Ferrosilite (mol%):2.1-14.5
Wollastonite (mol%):0.2-1.7
Magnetic suscept.:3.91
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:PSF
Main mass:M. Cimala
Comments:MC 082; submitted by P. Sipiera
   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)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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