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Northwest Africa 13221
Basic information Name: Northwest Africa 13221
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13221
Observed fall: No
Year found: 2019
Country: Mali
Mass:help 1097 g
Classification
  history:
Recommended:  L4    [explanation]

This is 1 of 1709 approved meteorites (plus 24 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13221 (NWA 13221)

Mali

Purchased: 2019 Sep

Classification: Ordinary chondrite (L4)

History: Purchased by Mbark Arjdal in September 2019 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed chondrules are set in a recrystallized matrix containing merrillite, chlorapatite, taenite, chromite, troilite, stained kamacite and pentlandite.

Geochemistry: Olivine (Fa24.9±0.1, range Fa24.8-25.1, N = 6), low-Ca pyroxene (Fs20.3±0.3Wo2.2±0.7, range Fs19.8-20.5Wo1.7-3.7, N = 6), augite (Fs8.8±0.9Wo43.5±1.5, range Fs7.8-9.6Wo45.1-42.2, N = 3).

Classification: Ordinary chondrite (L4).

Specimens: 66.9 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2019 Sep
Mass (g):1097
Pieces:4
Class:L4
Shock stage:S2
Weathering grade:W0/1
Fayalite (mol%):24.9±0.1
Ferrosilite (mol%):20.3±0.3
Wollastonite (mol%):2.2±0.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):66.9
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 136; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 54 approved meteorites from Mali (plus 1 unapproved name)

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