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Northwest Africa 11408
Basic information Name: Northwest Africa 11408
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11408
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 46.9 g
Meteoritical Bulletin:  MB 106  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 24 Sep 2017
Writeup from MB 106:

Northwest Africa 11408 (NWA 11408)


Purchased: February 2013

Classification: Ureilite

History: Purchased from Moroccan meteorite dealer in 2013.

Physical characteristics: Physical Characteristics: Single stone, black rough irregular exterior. Saw cut shows mostly dark grains with a few exhibiting greater light reflectance. Stone was difficult to cut.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows approx. 45% olivine, 45% pigeonite, and 8% low-Ca pyroxene, all with an average grain size of approx. 800 - 1000 μm. Fe-Ni veins, now mostly oxidized by desert weathering, occupy grain boundaries and also crosscut some grains. The veins contain numerous, irregularly shaped patches of graphite, partially altered to diamond, mainly 50-200 μm in length but with a few up to 1000 μm. Olivine grains in contact with metal veins or diamond commonly display Mg-rich alteration rims (70-300 μm) containing small (<2 μm), metal blebs either randomly distributed or in linear arrays. Pigeonite and low-Ca pyroxene occasionally show narrow patches of Mg-rich pyroxene along contacts with metal veins or diamond.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine cores Fa10.3±0.6, Fe/Mn=22.5±2.7, Cr2O3=0.52±0.04 wt%, n=22; olivine rims Fa1.4±1.0, Fe/Mn=3.2±1.7, Cr2O3=0.34±0.15 wt%, n=7; pigeonite Fs9.7±0.2 Wo8.6±0.1, Fe/Mn=14.4±1.0, Cr2O3=0.91±0.06 wt%, n=25; low-Ca pyroxene Fs9.5±0.4Wo4.9±0.1, Fe/Mn=15.7±1.8, Cr2O3=0.88±0.07 wt%, n=19; pyroxene rims Fs0.9±0.2Wo2.8±1.9, Fe/Mn=1.6±0.3, Cr2O3=0.29±0.09, n=7.

Classification: Achondrite (ureilite)

Specimens: 14.6 g including 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):46.9
Weathering grade:medium
Fayalite (mol%):10.3±0.6
Ferrosilite (mol%):9.7±0.2
Wollastonite (mol%):8.6±0.1
Classifier:K. Domanik and F. Stephan, UAz
Type spec mass (g):14.6
Type spec location:UAz
Main mass:Fredric Stephan
Comments:Working name U1; 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 1847 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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