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Northwest Africa 15989
Basic information Name: Northwest Africa 15989
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15989
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 224 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  EL4
Recommended:  EL4    [explanation]

This is 1 of 21 approved meteorites classified as EL4.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 30 Jul 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15989 (NWA 15989)

(Northwest Africa)

Purchased: 2023

Classification: Enstatite chondrite (EL4)

History: The meteorite was purchased from a meteorite dealer in Nigeria.

Physical characteristics: Brownish rock lacking fusion crust.

Petrography: The meteorite is composed of well defined, mostly flattend, separated chondrules (mean diameter about 500 µm) in a fine-grained mineral matrix. Enstatite is the only silicate present in chondrules and matrix; no plagioclase was detected. Opaque phases are Si-bearing kamacite, schreibersite, troilite, and daubréelite.

Geochemistry: enstatite: Fs0.6±0.3Wo0.3±0.1 (Fs0.2-1.3Wo0.1-0.6, n=12); kamacite: Ni=6.1±0.04, Si=0.45±0.01, Co=0.33±0.01, n=5; troilite: Cr=0.64±0.03, Ti=0.23±0.01, n=3; daubréelite: Mn=1.86±0.02, n=3 (all wt%)

Classification: Enstatite chondrite (EL4a). EL designation based on silica content in kamacite. ELa subgroup based on Cr contents in troilite, Ni contents in kamacite, and presence of daubréelite (Weyrauch et al., 2017).

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:
  MB112
  Table 0
  Line 0:
Place of purchase:Nigeria
Date:P 2023
Mass (g):224
Pieces:1
Class:EL4
Shock stage:S1
Weathering grade:moderate
Ferrosilite (mol%):0.6
Wollastonite (mol%):0.3
Classifier:A. Greshake, MNB
Type spec mass (g):24.8
Type spec location:MNB
Main mass:Chnaoui Larbi and Essibit Zaid
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9570 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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