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Northwest Africa 11354
Basic information Name: Northwest Africa 11354
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11354
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 15 kg
Meteoritical Bulletin:  MB 107  (2018)  Enst achon-ung
Recommended:  Enst achon-ung    [explanation]

This is 1 of 5 approved meteorites classified as Enst achon-ung.   [show all]
Search for other: Achondrites, Enstatite achondrites, Enstatite-rich meteorites, and Ungrouped achondrites
Comments: Approved 8 Oct 2018
Writeup from MB 107:

Northwest Africa 11354 (NWA 11354)


Purchased: Feb. 2017

Classification: Enstatite achondrite (ungrouped)

History: Purchased by Ke Zuokai in Feb. 2017 from a Moroccan dealer.

Physical characteristics: The meteorite is covered by a dark brown fusion crust.

Petrography: The meteorite is composed of medium-grained (~0.1-0.5 mm) silicates, metal and sulfide. Enstatite is the dominant silicate phase. Other silicates are olivine, albitic plagioclase and fine-grained diopside (4-20 μm). No chondrules or clasts are observed. Some regions of the thin section exhibite triple junctions. Metal and sulfide include kamacite, tanite, troilite, alabandite, daubreelite and schreibersite. Daubreelite often presents as lamellae within troilite.

Geochemistry: Enstatite Fs0.7-2.0Wo0.7-1.7 (n=19), Fe/Mn (cation ratio)=8.0±3.9; minor fine-grained Ca-rich pyroxene Fs43.1-47.2Wo43.1-47.2 (n=9), Fe/Mn (cation ratio)=16.6±10.8; plagioclase Ab71.5-83.6Or0.01-3.4 (n=9); olivine grains are almost pure fosterite Fo99.3-100 (n=18), Fe/Mn (cation ratio)=3.1±1.6. This meteorite lacks Si content in metal. Kamacite (wt%) Fe 92.49, Ni 5.99, Co 0.51, P 0.05. Taenite (wt%) Fe 75.71, Ni 23.55, Co 0.31. Troilite (wt%) Fe 63.11, S 36.07, Co 0.13, Ti 0.18, Cr 0.29, V 0.06. Daubreelite (wt%) Fe 19.69, Cr 36.44, S 44.28, Ni 0.07, Ti 0.01, P 0.04, Co 0.05. Sulfide is low in Si (below 0.01 wt%).

Classification: Enstatite achondrite ungrouped. The meteorite is chemically similar to equilibrated EL chondrites. However, it is distinguished from EL6 chondrite by the lack of chondrules and presence of olivine. Moreover, this meteorite has low Si content in metal (below detection limit) and low Ti content in troilite (0.16±0.02 wt%), similar to those in NWA 10519 (Enst achon-ung).

Data from:
  Table 0
  Line 0:
Place of purchase:Beijing China
Date:P Feb. 2017
Mass (g):15000
Class:Enst achon-ung
Shock stage:low
Weathering grade:W1
Fayalite (mol%):0.1±0.2 (n=18)
Ferrosilite (mol%):0.1±0.2 (n=19); 0.1±0.1 (n=9)
Wollastonite (mol%):1.4±0.3 (n=19); 45.8±1.1(n=9)
Classifier:Wu Y., PMO
Type spec mass (g):24
Type spec location:PMO
Main mass:Ke Zuokai
Comments:Submitted by Hsu W.
   and collections
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 2003 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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