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Northwest Africa 8474
Basic information Name: Northwest Africa 8474
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8474
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 24 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 26 Jul 2014
Writeup from MB 103:

Northwest Africa 8474 (NWA 8474)

(Northwest Africa)

Purchased: 2013 Jun

Classification: HED achondrite (Eucrite)

History: Purchased in 2013 in Zagora

Physical characteristics: Cut surface reveals a gray coarse brecciated interior.

Petrography: (J. Gattacceca, CEREGE) Brecciated ophitic to subophitic coarse basalt with crystal between 1 mm and 3 mm. Mineralogy: pigeonite with augite exsolution, plagioclase, accessory silica, chromite, ilmenite, Ca-phosphate, troilite, rare metal. Some pyroxenes are zoned, with outer rim enriched in iron.

Geochemistry: Pigeonite Fs35.7-59.1Wo6.9-26.9, FeO/MnO= 34.8±3.5 (n=13). Augite exsolution Fs30.7Wo43.5 (N=1). Orthopyroxene Fs65.8Wo2.5 (N=1). Plagioclase An78.2±2.2Ab20.0±1.8Or1.8±0.4 (N=7). Magnetic susceptibility log χ = 2.91 (χ in 10-9 m3/kg).

Classification: Achondrite (basaltic polymict eucrite). The polymict character is evidenced by the presence of both exsolved and zoned pyroxenes. Moderate weathering.

Specimens: 5 g in CEREGE, main mass with Labenne

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2013 Jun
Mass (g):24
Weathering grade:moderate
Ferrosilite (mol%):35.7-65.8
Wollastonite (mol%):2.5-26.9
Magnetic suscept.:2.91
Classifier:J. Gattacceca and M. Aboulahris, CEREGE
Type spec mass (g):5
Type spec location:CEREGE
Main mass:Luc Labenne
Comments:Submitted by J. Gattacceca
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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