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Northwest Africa 11411
Basic information Name: Northwest Africa 11411
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11411
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 175.1 g
Meteoritical Bulletin:  MB 106  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 623 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 24 Sep 2017
Writeup from MB 106:

Northwest Africa 11411 (NWA 11411)


Purchased: February 2013

Classification: Ureilite

History: Purchased from Moroccan meteorite dealer in 2013.

Physical characteristics: Physical Characteristics: Single stone with black/brown irregular weathered surface with small area of fusion crust. Saw cut shows dark interior with scattered reflective grains. Stone was extremely difficult to cut.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount reveals approx. 70% olivine, 26% pigeonite, with an average grain size of approx. 600-800 μm. Fe-Ni veins occupy grain boundaries most of which have been oxidized by desert weathering. Graphite, partially altered to diamond, is present along some grain boundaries as small domains 50-200 μm in size. Olivine grain boundaries in contact with metal veins or diamond are Mg-rich and contain extremely densely-packed tiny metal blebs, often coalescing into wide, mossy-textured haloes along vein edges, 100-150 μm in width.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine cores Fa20.8±0.9, Fe/Mn=42.2±4.5, Cr2O3=0.69±0.07 wt%, n=13; olivine rims Fa2.6±1.0, Fe/Mn=5.3±2.0, Cr2O3=0.72±0.25 wt%, n=6; pigeonite Fs17.8±0.2Wo8.4±0.1, Fe/Mn=26.6±1.9, Cr2O3=1.15±0.03 wt%, n=12.

Classification: Achondrite (ureilite)

Specimens: 42.7 g plus one probe mount on deposit at UAz, Fredric Stephan holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P February 2013
Mass (g):175.1
Weathering grade:high
Fayalite (mol%):20.8±0.9
Ferrosilite (mol%):17.8±0.2
Wollastonite (mol%):8.4±0.1
Classifier:F. Stephan and K. Domanik, UAz
Type spec mass (g):42.7
Type spec location:UAz
Main mass:Fredric Stephan
Comments:Working name FS0022; submitted by K. Domanik
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
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 1967 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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