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Northwest Africa 11455
Basic information Name: Northwest Africa 11455
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11455
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 263 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-unbr
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 90 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Oct 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11455 (NWA 11455)

(Northwest Africa)

Purchased: 2017 Apr

Classification: HED achondrite (Eucrite, unbrecciated)

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

Petrography: (A. Irving and S. Kuehner, UWS) Microgabbroic texture. Major minerals are exsolved pigeonite and calcic plagioclase (as equant grains, mean grainsize ~0.7 mm); accessory minerals include silica polymorph, ilmenite, chromite, troilite and Ni-poor metal.

Geochemistry: Host orthopyroxene (Fs59.1Wo2.6, FeO/MnO = 29), clinopyroxene exsolution lamella (Fs27.5Wo41.3, FeO/MnO = 28), host clinopyroxene (Fs27.6Wo42.5, FeO/MnO = 28), orthopyroxene exsolution lamella (Fs60.7Wo2.3, FeO/MnO = 30), plagioclase (An89.7-89.8Or0.5-0.6, N = 2).

Classification: Unbrecciated eucrite (microgabbroic).

Specimens: 20.55 g including one polished thin section at PSF; remainder with Kuntz.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2017 Apr
Mass (g):262.6
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):59.1; 27.5; 27.6; 60.7
Wollastonite (mol%):2.6; 41.3; 42.5; 2.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.55
Type spec location:PSF
Main mass:F. Kuntz
Comments:Work name K361; submitted by A. Irving
Institutions
   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)
Catalogs:
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:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Denis gourgues   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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