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Northwest Africa 13578
Basic information Name: Northwest Africa 13578
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13578
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 6.44 kg
Classification
  history:
Recommended:  CK6    [explanation]

This is 1 of 77 approved meteorites classified as CK6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 16 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13578 (NWA 13578)

Algeria

Purchased: 2020

Classification: Carbonaceous chondrite (CK6)

History: Purchased from Algeria by Abdelhadi Aithiba.

Physical characteristics: Shiny black exterior with patches of sandblasted, polygonally cracked, fusion crust. Some chondrule outlines were visible on the surface.

Petrography: (C. Agee, UNM) Microprobe BSE images revealed a few, large, faint chondrules (~1000 μm) set in a recrystallized matrix. Numerous opaques were observed throughout the meteorite, the majority of which were Cr-rich magnetite with some grains up to 500 μm. Fe-sulfide, Fe-Ni sulfide, and Ti-rich chromite were also observed as ubiquitous minor phases. Most chondrules were decorated with opaques. One observed porphyritic diopside-olivine chondrule was thickly mantled by coarse magnetite. The chondrule diopside had many fine, disseminated opaque inclusions. Plagioclase grain size was up to 150 μm in diameter.

Geochemistry: (C. Agee, UNM) Chondrule olivine Fa34.4±0.7, Fe/Mn=120±11, n=11; chondrule diopside Fs9.2±0.7Wo47.3±0.6, Fe/Mn=92±32, n=12; plagioclase Ab54.0±11.3An42.8±12.7Or3.2±1.5, n=8.

Classification: Carbonaceous chondrite (CK6)

Specimens: 22.9 g on deposit at UNM, Abdelhadi Aithiba holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020
Mass (g):6435
Pieces:1
Class:CK6
Shock stage:low
Weathering grade:low
Fayalite (mol%):34.4±0.7
Ferrosilite (mol%):9.2±0.7
Wollastonite (mol%):47.3±0.6
Classifier:C. Agee, UNM
Type spec mass (g):22.9
Type spec location:UNM
Main mass:Abdelhadi Aithiba
Comments:Submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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