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Northwest Africa 8405
Basic information Name: Northwest Africa 8405
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8405
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 501 g
Meteoritical Bulletin:  MB 105  (2016)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 43 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 30 Sep 2016
Writeup from MB 105:

Northwest Africa 8405 (NWA 8405)

(Northwest Africa)

Purchased: 2014 Nov

Classification: Angrite

History: Purchased by Scott Perekslis in November 2014 from a dealer in Erfoud, Morocco.

Physical characteristics: A dark, dense rock (501 g) lacking fusion crust. The fresh interior is mostly khaki-colored with visible black and white grains.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular texture, mean grainsize 0.6 mm with some oxide grains (pleonaste spinel) up to 5 mm. Composed of olivine, Al-Ti-augite (pink in thin section), anorthite, pleonaste spinel (purple-brown in thin section), Mg-merrillite and troilite (partially altered to iron hydroxides).

Geochemistry: Olivine (Fa45.0-45.8, FeO/MnO = 65-75, CaO = 1.5-1.6 wt.%, N = 4), Al-Ti-augite (Fs11.4-11.7Wo55.4-56.1, FeO/MnO = 58-67, Al2O3 = 9.7-10.3 wt.%, TiO2 = 2.0-2.2 wt.%, N = 3), anorthite (An99.2-99.3Or0.1, N = 2).

Classification: Angrite. Paired with NWA 4801.

Specimens: 20.1 g including one polished thin section at UWB; remainder with Mr. S. Perekslis.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2014 Nov
Mass (g):501
Shock stage:low
Weathering grade:low
Fayalite (mol%):45.0-45.8
Ferrosilite (mol%):11.4-11.7
Wollastonite (mol%):55.4-56.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:S. Perekslis
Comments:Submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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