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Northwest Africa 11412
Basic information Name: Northwest Africa 11412
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11412
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 96.1 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 11412 (NWA 11412)


Purchased: February 2014

Classification: Ureilite

History: Purchased from Moroccan meteorite dealer in 2014.

Physical characteristics: Physical Characteristics: Single stone, black rough irregular surface. Saw cut reveals mosaic of dark green and brown grains, a few minor terrestrial calcite veins. Stone was difficult to cut.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows approx. 75% olivine, 21% pigeonite, with an average grain size of approx. 1000-1500 μm. Fe-Ni veins occupy grain boundaries, most of which have been oxidized by desert weathering. Graphite, partially altered to diamond, is common along grain boundaries, occurring mainly as small domains 100-200 μm in size but with a few patches up to 1000 μm in length. Olivine grain boundaries in contact with metal veins or graphite are reduced and contain an abundance of tiny metal blebs forming rims approx. 100-150 μm in width. A few scattered, vein-like patches of lower-Ca pigeonite associated with voids, Fe-metal blebs, and small Si-rich inclusions are observed cross-cutting individual pigeonite grains.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine cores Fa21.7±0.7, Fe/Mn=49.7±5.6, Cr2O3=0.56±0.15 wt%, n=20; olivine rims Fa2.3±0.5, Fe/Mn=4.1±0.8, Cr2O3=0.55±0.03 wt%, n=3; pigeonite cores Fs18.3±0.3Wo10.6±0.2, Fe/Mn=29.0±3.0, Cr2O3=1.24±0.06 wt%, Al2O3=1.43±0.10 wt%, n=14; pigeonite (patches and veins) Fs14.3±1.2Wo5.3±0.7, Fe/Mn=24.1±2.6, Cr2O3=1.19±0.08 wt%, Al2O3=0.28±0.05 wt%, n=5.

Classification: Achondrite (Ureilite)

Specimens: 21.3 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 2014
Mass (g):96.1
Weathering grade:medium
Fayalite (mol%):21.7±0.7
Ferrosilite (mol%):18.3±0.3
Wollastonite (mol%):10.6±0.2
Classifier:K. Domanik and F. Stephan, UAz
Type spec mass (g):21.3
Type spec location:UAz
Main mass:Fredric Stephan
Comments:Working name FS0023; 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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