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Northwest Africa 8420
Basic information Name: Northwest Africa 8420
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8420
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 257 g
Meteoritical Bulletin:  MB 104  (2015)  L3
Recommended:  L3    [explanation]

This is 1 of 727 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 29 Jan 2015
Writeup from MB 104:

Northwest Africa 8420 (NWA 8420)

(Northwest Africa)

Purchased: 2014 Mar

Classification: Ordinary chondrite (L3)

History: Purchased in Temara, Morocco by Adam Aaronson in March 2014.

Petrography: (A. Irving and S. Kuehner, UWS) Closely-packed, medium-sized (1.7±0.8 mm), well-formed, spheroidal to ellipsoidal chondrules (some with metal-rich rims) are set in a very sparse matrix containing stained metal.

Geochemistry: Olivine, Fa9.0-40.6; Cr2O3 in ferroan olivine = 0.07-0.31 wt.%, mean 0.13±0.10 wt.%, N = 8; orthopyroxene, Fs2.3-10.0Wo0.4-2.2, N = 3; subcalcic augite, Fs19.1-28.2Wo30.6-23.9; augite, Fs4.5Wo44.3.

Classification: Ordinary chondrite (L3).

Specimens: 20.1 g including one polished thin section at UWB. The remainder is held by Aaronson.

Data from:
  Table 0
  Line 0:
Place of purchase:Temara
Date:P 2014 Mar
Mass (g):257
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):9.0-40.6
Ferrosilite (mol%):2.3-10.0
Wollastonite (mol%):0.4-2.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:A. Aaronson
Comments:M1672; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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