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Northwest Africa 12891
Basic information Name: Northwest Africa 12891
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12891
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 1580 g
Meteoritical Bulletin:  MB 108  (2020)  L3
Recommended:  L3    [explanation]

This is 1 of 717 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 7 Sep 2019
Writeup from MB 108:

Northwest Africa 12891 (NWA 12891)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by PSF, then sold in 2019 to the Harkness Collection.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed chondrules (apparent diameter 830±420 µm, N = 23) are set in a sparse, finer grained matrix containing stained metal.

Geochemistry: Olivine (Fa24.1±2.8 (range Fa19.0-27.5, N = 6); Cr2O3 in ferroan examples <0.04 wt.%), low-Ca pyroxene (Fs20.8Wo0.7; Fs12.9Wo5.0), subcalcic augite (Fs9.6Wo33.3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.92.

Classification: Ordinary chondrite (L3).

Specimens: 33.72 g including one polished thin section at PSF; remainder in Harkness Collection.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):1580
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):24.1±2.8
Ferrosilite (mol%):20.8; 12.9
Wollastonite (mol%):0.7; 5.0
Magnetic suscept.:4.92
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):33.72
Type spec location:PSF
Main mass:Harkness Collection
Comments:Work name HC5; 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)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 7643 approved meteorites from (Northwest Africa) (plus 1979 unapproved names)

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