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Northwest Africa 11409
Basic information Name: Northwest Africa 11409
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11409
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 13 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 11409 (NWA 11409)


Purchased: February 2013

Classification: Ureilite

History: Purchased from Moroccan meteorite dealer in 2013.

Physical characteristics: Physical Characteristics: Three stones exhibiting black irregular surfaces. Saw cut shows dark greenish-brown coarse grains separated by thin reflective veins.

Petrography: (K. Domanik and F. Stephan, UAz) Microprobe examination of a polished mount shows approx. 80% olivine and 15% pyroxene. The average grain size of both olivine and pyroxene is approx. 1-2 mm. Numerous oxidized Fe-Ni veins 5-30 μm wide occupy grain boundaries and also crosscut some grains. The veins contain a number of large irregularly shaped lenses of graphite, partially altered to diamond, 500-1500 μm long and 30-100 μm wide. In a few cases olivine grain boundaries in contact with larger metal veins or with diamond display a thin, discontinuous, Mg-rich rim, 2-10 μm wide, containing scattered, tiny (<2um) metal blebs. Pyroxene consists entirely of a patchy, mottled mixture of pigeonite and low-Ca pyroxene containing abundant void spaces, scattered Fe-metal blebs, and small Si-rich inclusions.

Geochemistry: Mineral compositions and geochemistry: (K. Domanik and F. Stephan, UAz) Olivine cores Fa21.3±1.5, Fe/Mn=46.4±6.7, Cr2O3=0.64±0.10 wt%, n=16; olivine rims Fa2.2±0.8, Fe/Mn=7.3±2.7, Cr2O3=0.42±0.14 wt%, n=11; pigeonite Fs17.2±2.3Wo7.9±0.9, Fe/Mn=24.9±4.5, Cr2O3=1.16±0.05 wt%, n=9; low-Ca pyroxene Fs13.5±0.7Wo2.7±0.4, Fe/Mn=24.7±5.7, Cr2O3=0.94±0.09 wt%, n=4.

Classification: Achondrite (Ureilite)

Specimens: 5.2 g plus three probe mounts on deposit at UAz, UAz holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P February 2013
Mass (g):13.0
Weathering grade:medium
Fayalite (mol%):21.3±1.5
Ferrosilite (mol%):17.2±2.3
Wollastonite (mol%):7.9±0.9
Classifier:K. Domanik and F. Stephan, UAz
Type spec mass (g):5.2
Type spec location:UAz
Main mass:UAz
Comments:Working name U2; 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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