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Northwest Africa 12266
Basic information Name: Northwest Africa 12266
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12266
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 1277 g
Classification
  history:
Recommended:  L3    [explanation]

This is 1 of 811 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 2 Aug 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 12266 (NWA 12266)

(Northwest Africa)

Purchased: 2018 Jun

Classification: Ordinary chondrite (L3)

History: Purchased by Ben Hoefnagels in June 2018 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Closely-packed, well-formed chondrules (apparent diameter 510±290 µm, N = 22) are set in a sparse, brown-stained matrix containing very little fresh metal (kamacite with taenite).

Geochemistry: Olivine (Fa19.1±14.2, range Fa0.9-37.2, N = 5; Cr2O3 in ferroan examples 0.02-0.08 wt.%, mean 0.05±0.02 wt.%, N = 6), orthopyroxene (Fs8.3±9.0Wo0.7±0.8, range Fs0.6-21.0Wo0.2-1.9, N = 4), pigeonite (Fs5.8Wo12.1), augite (Fs16.5Wo35.9), diopside (Fs1.6Wo43.6). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 3.283, 3.116, 3.446; δ18O 4.842, 4.425, 5.206; Δ17O 0.726, 0.780, 0.697 per mil. Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.57.

Classification: Ordinary chondrite (L3).

Specimens: 35.7 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018 Jun
Mass (g):1277
Pieces:1
Class:L3
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):19.1±14.2
Ferrosilite (mol%):8.3±9.0
Wollastonite (mol%):0.7±0.8
Magnetic suscept.:4.57
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):35.7
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH152; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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