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Northwest Africa 12737
Basic information Name: Northwest Africa 12737
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12737
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 966 g
Meteoritical Bulletin:  MB 108  (2020)  CK5
Recommended:  CK5    [explanation]

This is 1 of 205 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 27 Jul 2019
Writeup from MB 108:

Northwest Africa 12737 (NWA 12737)

(Northwest Africa)

Purchased: 2019 Mar

Classification: Carbonaceous chondrite (CK5)

History: Purchased in Temara, Morocco, by Adam Aaronson in March 2019.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh specimen composed of some separated, well-formed chondrules in a recrystallized matrix containing Cr-magnetite (with rare inclusions of chlorapatite and ilmenite), intermediate plagioclase, pentlandite and troilite.

Geochemistry: Olivine (Fa29.6±0.4 (range Fa29.0-29.9), N = 4), low-Ca pyroxene (Fs25.8±0.2Wo0.9±0.3 (range Fs25.6-25.9Wo1.1-0.7), N = 2), pigeonite (Fs22.0Wo13.0), augite (Fs11.3Wo41.6), plagioclase (An63.8Or0.7). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -3.772, -4.218, -4.061; δ18O 0.935, 0.273, 0.431; Δ17O -4.266, -4.362, -4.289 per mil.

Classification: Carbonaceous chondrite (CK5).

Specimens: 21.6 g including one polished thin section at UWB; remainder with Aaronson.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2019 Mar
Mass (g):966
Shock stage:low
Weathering grade:low
Fayalite (mol%):29.6±0.4
Ferrosilite (mol%):25.8±0.2
Wollastonite (mol%):0.9±0.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.6
Type spec location:UWB
Main mass:Aaronson
Comments:Work name M2190; submitted by A. Irving
Plots: O isotopes:  
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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