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Northwest Africa 11211
Basic information Name: Northwest Africa 11211
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11211
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 305 g
Meteoritical Bulletin:  MB 106  (2018)  LL3.10
Recommended:  LL3.10    [explanation]

This is 1 of 7 approved meteorites classified as LL3.10.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 21 Apr 2017
Writeup from MB 106:

Northwest Africa 11211 (NWA 11211)

(Northwest Africa)

Purchased: 2017

Classification: Ordinary chondrite (LL3.10)

History: Purchased by Darryl Pitt from a Moroccan meteorite dealer in February 2017 at the Tucson Gem and Mineral Show.

Physical characteristics: Single stone with fusion crust. A sawn surface reveals many densely packed chondrules of variable size.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, apparent mean diameter 750±450 μm (n=25), many with porphyritic, igneous-zoned olivines and pyroxenes, most with glass or mesostasis. Fine-grained matrix was observed throughout.

Geochemistry: (C. Agee and B. Ha, UNM) All olivine range Fa0.7-33.2, mean value Fa16.5±7.9, Fe/Mn=47±20, Cr2O3=0.42±0.22 (wt%), n=33; mean values for ferroan olivine Fa18.0±6.5, Fe/Mn=49±18, Cr2O3=0.43±0.23 (wt%), n=30; low-Ca pyroxene Fs10.7±8.7Wo0.9±0.9, Fe/Mn=26±20, n=21.

Classification: Ordinary chondrite (LL3.10), type 3.10 based on ferroan olivine mean Cr2O3 content and sigma from Grossman and Brearley (2005) and by the presence of opaque, S-rich matrix. Cr2O3 versus sigma value plots very close to the boundary between type 3.10 and 3.05 in figure 13 of G&B (2005), midway between EET 90161 (L3.05) and the cluster with RC 075 (H3.10), MET 96503 (L3.10), NWA 1756 (LL3.10), NWA 3127 (LL3.10).

Specimens: 20.7 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem & Mineral Show
Date:P 2017
Mass (g):305
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):16.5±7.9
Ferrosilite (mol%):10.7±8.7
Wollastonite (mol%):0.9±0.9
Classifier:C. Agee, UNM
Type spec mass (g):20.7
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Submitted by C. Agee
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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