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Northwest Africa 12242
Basic information Name: Northwest Africa 12242
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12242
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 101.7 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  CK3
Recommended:  CK3    [explanation]

This is 1 of 86 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 8 May 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 12242 (NWA 12242)

Algeria

Purchased: 2018 May

Classification: Carbonaceous chondrite (CK3)

History: Found in Algeria and purchased by Darryl Pitt in May 2018 from a Mauritanian dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Separated, unequilibrated chondrules (apparent diameter 1010±390 µm, N = 17) containing Cr-magnetite and Al-Ti-rich subcalcic augite together with rare fine grained CAI are set in a fine grained matrix (40 vol.%, deep orange in thin section) containing altered Cr-magnetite and calcite.

Geochemistry: (S. Kuehner, UWS and J. Boesenberg, BrownU) Olivine (Fa20.6±15.2, range Fa0.3-35.7, N = 8), subcalcic augite (Fs2.1Wo30.0, Al2O3 = 4.7 wt.%, TiO2 = 1.4 wt.%), augite (Fs11.8±3.9Wo49.1±0.5, range Fs7.4-15.1Wo48.6-49.6, N = 5), magnetite (Cr2O3 3.5±0.45 wt.%, range 2.7-3.9 wt.%, N = 9).

Classification: Carbonaceous chondrite (CK3). The Cr2O3 contents in magnetite are within the range for CK chondrites.

Specimens: 20.1 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018 May
Mass (g):101.7
Pieces:1
Class:CK3
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):0.3-35.0
Ferrosilite (mol%):2.1; 7.6
Wollastonite (mol%):30; 48.6
Classifier:A. Irving & S. Kuehner, UWS; J. Boesenberg, BrownU
Type spec mass (g):20.1
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 368; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1356 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
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Revision
  history:
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