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Northwest Africa 15739
Basic information Name: Northwest Africa 15739
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15739
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 294 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 621 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 23 Feb 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15739 (NWA 15739)

Algeria

Purchased: 2022

Classification: Carbonaceous chondrite (CM2)

History: Bought by Emilie Cèbe, Arnaud Valz-Blin (Eclectic-Art) and Laurent Lodé on 21 December 2022 from the Moroccan meteorite dealer Yunès Chaoui.

Physical characteristics: Many dark fragments.

Petrography: (J. Gattacceca, CEREGE) Chondrite with chondrules with average apparent diameter 250±150 µm (n=25), chondrule fragments and mineral fragments set in an abundant fine-grained, iron-rich matrix (69 vol% by point counting, n=228). No CAI was observed. Opaque minerals are metal, in chondrules and in the matrix as blebs up to 100 µm sized, magnetite and sulfides.

Geochemistry: Olivine Fa9.0±15.0, range Fa0.6-44.2 (n=10), Cr2O3 in ferroan olivine 0.46±0.10 wt% (n=5). Defocused matrix analyses FeO 33.3±1.2 wt%, analytical total 87.0±1.1 wt% (n=3).

Classification: Carbonaceous chondrite (CM2). The presence of phyllosiciliates is deduced from the low analytical totals of matrix analyses, although they are in the upper range of what is observed in CM2 chondrites (fig. 11 of Krämer-Ruggiu et al., 2022).

Specimens: Type specimen at CEREGE, main mass with Emilie Cèbe and Arnaud Valz-Blin (Eclectic-Art).

Bibliography:
  • Krämer Ruggiu L., Devouard B., Gattacceca J., Bonal L., Leroux H., Eschrig J., Borschneck D., King A. J., Beck P., Marrocchi Y., Debaille V., Hanna R. D. and Grauby O. (2022) Detection of incipient aqueous alteration in carbonaceous chondrites. Geochimica et Cosmochimica Acta 336, 308–331. (link)
Data from:
  MB112
  Table 0
  Line 0:
Date:P 2022
Mass (g):293.87
Pieces:many
Class:CM2
Weathering grade:low
Fayalite (mol%):9.0±15.0 (n=10)
Magnetic suscept.:4.20
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):20.25
Type spec location:CEREGE
Main mass:Emilie Cèbe and Arnaud Valz-Blin (Eclectic-Art)
Finder:anonymous
Comments:work name CM177/EA004; submitted by Jérôme Gattacceca
Institutions
   and collections		 CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1273 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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