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Northwest Africa 11358
Basic information Name: Northwest Africa 11358
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11358
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 329 g
Meteoritical Bulletin:  MB 106  (2018)  CO3.6
Recommended:  CO3.6    [explanation]

This is 1 of 8 approved meteorites classified as CO3.6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 23 Sep 2017
Writeup from MB 106:

Northwest Africa 11358 (NWA 11358)

(Northwest Africa)

Purchased: 2013 July 12

Classification: Carbonaceous chondrite (CO3.6)

History: Purchased in 2013 by John Shea from Aziz Habibi who acquired it from Morocco.

Physical characteristics: Exterior shows weathering patina. Cut face shows 2-5 mm thick alteration zone. Fine-grained gray-brown interior.

Petrography: Chondrules are abundant and relatively small (average = 0.26±14 mm, N=36). Olivine has slight undulatory extinction; but only a few single sets of planar fractures, indicating shock stage S2. Contains approximately 2% metal, of which about half has been converted to weathering products. AOAs and CAIs are abundant comprising ~10 % of the thin section.

Geochemistry: Olivine (Fa27.1±13.5, range Fa0-41.7, N=35). Low-Ca pyroxene (Fs2.7±2.5Wo1.7±1.1, range Fs0-9.5Wo0-4.3, N=22). Oxygen isotopes (K. Ziegler, UNM): 4 analyses, with δ17O = -7.492, -6.173, -5.322, -4.385 and δ18O = -4.704, -2.736, -1.691, -0.452 (linearized values).

Classification: Chondrule size and abundance consistent with CO class. CO class confirmed with O isotopes. Mean Fa (mol%) of 27.1 and D(Fa)/mean Fa(%) of 49.9 are both consistent with subtype 3.6 (Sears et al., 1991).

Specimens: Cascadia holds a 46.4 g piece, a 2.0 g piece, a polished thin section, and a potted butt. John Shea holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:E-mail
Date:P 2013 July 12
Mass (g):329.0
Shock stage:S2
Fayalite (mol%):27.1±13.5
Ferrosilite (mol%):2.7±2.5
Wollastonite (mol%):1.7±1.1
Classifier:M. Ream, M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):48.4
Type spec location:Cascadia
Main mass:John A. Shea, 201 East Valley Rd, Wallingford, PA, 19086
Comments:Lab number CML0816; 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 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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