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Northwest Africa 15197
Basic information Name: Northwest Africa 15197
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15197
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1446 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL4-6-melt breccia
Recommended:  LL4-6-melt breccia    [explanation]

This is the only approved meteorite classified as LL4-6-melt breccia.
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Oct 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15197 (NWA 15197)

(Northwest Africa)

Purchased: 2022

Classification: LL4-6-melt breccia

History: The meteorite was reportedly found February, 2022, near the city of Tan-Tan, Morocco, and subsequently purchased by the main mass holder from a Moroccan meteorite dealer on the meteorite fair in Ensisheim, France.

Physical characteristics: Dark grayish rock almost completely covered with fusion crust.

Petrography: The meteorite consists of a light grayish chondritic (about 20 vol%) and a dark fine-grained melt lithology (about 80 vol%). The chondritic lithology contains up to 1 cm sized LL6 type fragments in a fine-grained clastic LL4 type matrix with several chondrules and compositionally unequilibrated low-Ca pyroxene. The melt lithology is composed of about 100 µm sized euhedral to subhedral olivine grains and abundant interstitial mesostasis quenched to dendritic olivine and pyroxene in a glassy groundmass. Few sulfide and FeNi-metal spheres are present. Up to 1.4 cm sized melt fragments are also present in the chondritic lithology.

Geochemistry: Chondritic lithologies: olivine: Fa28.0±0.3 (Fa27.5-28.6, n=10); low-Ca pyroxene: Fs23.3±0.2Wo1.8±0.1 (Fs22.9-23.6Wo1.6-1.9, n=5); type 4 lithology low-Ca pyroxene: Fs21.2±4.0Wo1.6±0.8 (Fs12.3-24.3Wo0.1-2.2, n=8); melt lithology: olivine: Fa25.5±0.5 (Fa25.1-26.6, n=7)

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2022
Mass (g):1446
Pieces:1
Class:LL4-6-melt breccia
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):28.0; 25.5
Ferrosilite (mol%):23.3; 21.2
Wollastonite (mol%):1.8; 1.6
Classifier:A. Greshake, MNB
Type spec mass (g):48.9
Type spec location:MNB
Main mass:David Göttlich
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 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. ?
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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