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Northwest Africa 14054
Basic information Name: Northwest Africa 14054
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14054
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 127 g
Classification
  history:
Recommended:  EL6    [explanation]

This is 1 of 123 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 17 Jul 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14054 (NWA 14054)

Morocco

Purchased: 2020 Jan

Classification: Enstatite chondrite (EL6)

History: Purchased from a Moroccan dealer at the Tucson show

Physical characteristics: (R. Szczuczko) The exterior of the small flat brown stone is weathered with numerous fractures. The interior reveals a lightly mottled brown surface with numerous filled fractures and local patches of metal flecks.

Petrography: (C. Herd and A. Locock, UAb) Optical examination of a thin section shows an equilibrated and highly fractured texture, with numerous crosscutting iron oxide veins and veinlets. EMP- and SEM-based backscattered imaging of a polished mount shows that accessory minerals include troilite, daubreelite, kamacite and schreibersite; these are surrounded by iron oxide. No Mn,Mg sulfides were found. Two possible relict chondrules were identified.

Geochemistry: (C. Herd and A. Locock, UAb) Data obtained by EMP examination of carbon-coated probe mount: Enstatite Fs0.7±0.4Wo1.4±0.0 (n=40); Plagioclase An16Ab80Or4 (n=2). Kamacite (wt%) Fe 91.7±0.8, Ni 6.0±0.1 , Co 0.26±0.2 , Si 1.69±0.06 (n=13). Troilite (wt%) Cr 0.85±0.25 (maximum 1.67), Ti = 0.54±0.03.

Classification: Enstatite chondrite, EL6, based on mineralogy, equilibrated texture, and Si content in kamacite. Belongs to the ELa subgroup of Weyrauch et al. (2017) based on Cr and Ti contents of troilite.

Specimens: Type specimen of 25.2 g is at UAb. Main mass, polished mount and thin section with the owner.

Bibliography:
  • Weyrauch M., Horstmann M., and Bischoff A. (2017) Chemical variations of sulfides and metal in enstatite chondrites—Introduction of a new classification scheme. 53, 394-415. (link)
Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2020 Jan
Mass (g):127
Pieces:1
Class:EL6
Shock stage:low
Weathering grade:high
Ferrosilite (mol%):0.7±0.4 (n=40)
Wollastonite (mol%):1.4±0.0 (n=40)
Classifier:C. Herd, UAb, and R. Szczuzko
Type spec mass (g):25.2
Type spec location:UAb
Main mass:R. Szczuczko
Comments:Field number 3Z-8; submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1652 approved meteorites from Morocco (plus 23 unapproved names) (plus 1 impact crater)

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