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Northwest Africa 15315
Basic information Name: Northwest Africa 15315
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15315
Observed fall: No
Year found: 2022
Country: Mali
Mass:help 162 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  L4-5
Recommended:  L4-5    [explanation]

This is 1 of 30 approved meteorites classified as L4-5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Oct 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15315 (NWA 15315)

Mali

Purchased: 2022 Jan

Classification: Ordinary chondrite (L4-5)

History: Found in Mali and purchased by Mbark Arjdal in January 2022 from a Malian dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Breccia composed of Type 4 chondrite clasts, discrete equilibrated chondrules and Type 5 chondrite clasts in a sparse fine-grained matrix. Type 4 clasts contain well-formed equilibrated chondrules set in a relatively coarse-grained matrix containing stained kamacite, troilite, chromite, augite, merrillite and chlorapatite, but no plagioclase. Type 5 clasts have only sparse chondrules within a recrystallized matrix containing stained holly leaf-shaped kamacite grains. Some patches of almost opaque shock melt are present in the studied thin section.

Geochemistry: Olivine (Fa24.2±0.9, range Fa21.7-25.2, N = 12), low-Ca pyroxene (Fs20.8±0.6Wo1.7±0.5, range Fs19.9-22.1Wo0.9-2.2, N = 11).

Classification: Ordinary chondrite (L4-5 breccia).

Specimens: 37.9 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2022 Jan
Mass (g):162
Pieces:1
Class:L4-5
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):24.2±0.9
Ferrosilite (mol%):20.8±0.6
Wollastonite (mol%):1.7±0.5
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):37.9
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 825; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 116 approved meteorites from Mali (plus 2 unapproved names)
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Revision
  history:
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