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Northwest Africa 11490
Basic information Name: Northwest Africa 11490
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11490
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 131.3 g
Meteoritical Bulletin:  MB 106  (2018)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 432 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 28 Nov 2017
Writeup from MB 106:

Northwest Africa 11490 (NWA 11490)

(Northwest Africa)

Purchased: 2017 Apr

Classification: HED achondrite (Howardite)

History: Purchased by Fabien Kuntz in April 2017 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of ~60 vol.% diogenitic orthopyroxene (as angular grains exhibiting undulose extinction), ~35 vol.% eucritic material and ~5 vol.% dark carbonaceous chondrite clasts. Most eucritic material consists of disaggregated grains of exsolved pigeonite, unexsolved pigeonite, subcalcic augite and calcic plagioclase, but some lithic clasts with subophitic and microgabbroic textures are also present. Accessory minerals include silica polymorph, chromite, ilmenite, fayalite, baddeleyite, troilite, pentlandite and Ni-poor metal.

Geochemistry: Diogenitic orthopyroxene (Fs27.6-29.7Wo3.6-3.8, FeO/MnO = 32, N = 2), orthopyroxene host (Fs64.0Wo1.9, FeO/MnO = 31), orthopyroxene host (Fs42.3Wo1.9, FeO/MnO = 35), clinopyroxene exsolution lamella (Fs15.4Wo45.4, FeO/MnO = 30), pigeonite (Fs45.9Wo9.1; Fs52.5Wo11.7; Fs55.9Wo23.3; FeO/MnO = 30-35; N = 3), subcalcic augite (Fs34.4Wo32.2, FeO/MnO = 28), fayalite (Fa85.4, FeO/MnO = 40), plagioclase (An91.1-92.8Or0.4-0.3, N = 2), forsterite in carbonaceous chondrite clast (Fa0.9), enstatite in carbonaceous chondrite clast (Fs0.6Wo0.9).

Classification: Howardite.

Specimens: 20.29 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2017 Apr
Mass (g):131.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):85.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.29
Type spec location:PSF
Main mass:F. Kuntz
Comments:Work name K329; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; 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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Domjan Svilkovic   
Mike Markowitz   

     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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