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Northwest Africa 11699
Basic information Name: Northwest Africa 11699
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11699
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 75.6 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  CM2
Recommended:  CM2    [explanation]

This is 1 of 622 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 27 Mar 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11699 (NWA 11699)

(Northwest Africa)

Purchased: 2017 Oct

Classification: Carbonaceous chondrite (CM2)

History: Purchased by Ben Hoefnagels in October 2017 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS; L. Garvie, ASU) Very small, well-formed granular chondrules (apparent diameter 200±70 µm, N = 14), mineral fragments and sparse very fine grained CAI are set in a finer grained matrix (deep sepia brown in thin section) containing clay minerals and serpentine (both confirmed by powder X-ray diffraction) plus accessory phosphoran Fe-Ni sulfides.

Geochemistry: Olivine (Fa0.4-58.8, N = 3), orthopyroxene (Fs0.6-0.7Wo1.3-0.8, N = 2), clinopyroxene (Fs0.7-0.8Wo44.6-40.1, N = 2). Oxygen isotopes (K. Ziegler, ASU) δ17O -0.850, -1.728; δ18O 6.238, 5.426; Δ17O -4.144, -4.593 (all per mil).

Classification: Carbonaceous chondrite (CM2). The presence of phosphoran Fe-Ni sulfides in this specimen is notable and represents only the second such confirmation among northwest African specimens. Phosphoran Fe-Ni sulfides were previously described in CM chondrites by Nazarov et al. (2009) and in CM-related clasts within polymict eucrite NWA 5232 by Kuehner et al. (LPSC 40, #2314, 2009).

Specimens: 15.2 g including one polished thin section at UWB; main mass with Mr. B. Hoefnagels.

Bibliography:
  • Nazarov M.A., Kurat G., Brandstaetter F., Ntaflos T., Chaussidon M., and Hoppe P. (2009) Phosphorus-bearing sulfides and their associations in CM chondrites. Petrology 17, 101–123. (link)
Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Oct
Mass (g):75.6
Pieces:1
Class:CM2
Shock stage:S1
Weathering grade:low
Fayalite (mol%):0.4-58.8
Ferrosilite (mol%):0.6-0.7
Wollastonite (mol%):1.3-0.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):15.2
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH129; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections		 ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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