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Northwest Africa 11357
Basic information Name: Northwest Africa 11357
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11357
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 1237 g
Meteoritical Bulletin:  MB 106  (2018)  CV3
Recommended:  CV3    [explanation]

This is 1 of 476 approved meteorites (plus 2 unapproved names) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 23 Sep 2017
Writeup from MB 106:

Northwest Africa 11357 (NWA 11357)

(Northwest Africa)

Purchased: 2006 Sept

Classification: Carbonaceous chondrite (CV3)

History: Purchased in 2012 by Ronnie McKenzie at the Denver show.

Petrography: Section composed of large chondrules (up to 3 mm in diameter), AOAs and CAIs set in a fine-grained matrix. The matrix makes up about 40% of the thin section area. Olivine is commonly zoned, with Mg-rich cores and Fe-rich rims. Many olivine grains show weak mosaicism and 2 sets of planar fractures, indicating shock stage S4. Metal abundance is <1%; the six analyzed were all awaruite. Sulfides lack Ni, and are moderately weathered. Small patches and minor veins of calcium sulfate are present. Phyllosilicates are replacing edges of olivine and pyroxene grains in or adjacent to matrix

Geochemistry: Olivine (Fa6.72±4.13, range = Fa0-14.6, N=53). Low-Ca pyroxene (Fs 1.75±1.43Wo1.89±1.89, range = Fs0-5.6Wo0-9.2, N=35). Oyxgen isotopes (K. Ziegler, UNM): 4 analyses, with δ17O = -4.290, -3.513, -7.649, -4.434 and δ18O = 0.725, 0.926, -3.555, -0.011 (linearized values).

Classification: Large chondrule size with abundant AOAs and CAIs indicates CV chondrite class, which is confirmed with oxygen isotopes. Zoned grains and mineral chemistry indicates type 3.

Specimens: Cascadia holds a 22.7 g piece, a polished thin section, and a potted butt. Mr. McKenzie holds the main mass

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2006 Sept
Mass (g):1237.2
Shock stage:S4
Fayalite (mol%):6.72±4.13
Ferrosilite (mol%):1.75±1.43
Wollastonite (mol%):1.89±1.89
Classifier:M. Ream, M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):22.7
Type spec location:Cascadia
Main mass:Mr. Ronnie McKenzie, Pretoria, South Africa
Comments:Lab number CML0678; field number RM#5; submitted by M. Hutson
Plots: O isotopes:  
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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