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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 71 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1133 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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