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Northwest Africa 12264
Basic information Name: Northwest Africa 12264
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12264
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 50.8 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 99 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 5 Jan 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12264 (NWA 12264)

(Northwest Africa)

Purchased: 2018 Aug

Classification: Ungrouped achondrite

History: Purchased by Ben Hoefnagels in August 2018 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS; P. Carpenter, WUSL) Breccia composed almost entirely (>95 vol.%) of closely packed, angular grains of olivine (some up to 9 mm across, exhibiting undulose extinction) in a sparse olivine-rich matrix containing minor chromite, low-Ca pyroxene, plagioclase and rare exsolved pigeonite. Some symplectitic intergrowths of chromite and pyroxene are also present.

Geochemistry: Olivine (Fa20.8-22.0, FeO/MnO = 74-88, N = 4), low-Ca pyroxene (Fs17.6-17.7Wo4.8-4.3, FeO/MnO = 64-69, N = 2), clinopyroxene host in exsolved pigeonite (Fs26.6Wo39.6, FeO/MnO = 51), orthopyroxene exsolution lamella (Fs53.1Wo4.5, FeO/MnO = 69), plagioclase (An51.8Or2.6). Oxygen isotopes (K. Ziegler, UNM): Analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -2.886, -3.489, -3.605; δ18O 0.467, -0.028, -0.092; Δ17O -3.133, -3.474, -3.557 per mil.

Classification: Achondrite (ungrouped, dunitic breccia). Oxygen isotopes plot close to the values for the Milton pallasite (Jones et al., 2003) and between the trends for CR chondrites and CV chondrites.

Specimens: 10.4 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Bibliography:
  • Jones R.H., Wasson J.T., Larson T., and Sharp Z.D. (2003) Milton: a new, unique pallasite. Lun. Planet. Sci. 34, abstract no. 1683. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2018 Aug
Mass (g):50.8
Pieces:1
Class:Achondrite-ung
Shock stage:low
Weathering grade:low
Fayalite (mol%):20.8-22.0
Ferrosilite (mol%):17.6-17.7
Wollastonite (mol%):4.8-4.3
Classifier:A. Irving, S. Kuehner, UWS; P. Carpenter, WUSL
Type spec mass (g):10.4
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH163; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections		 UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7374 approved meteorites from (Northwest Africa) (plus 1957 unapproved names)

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