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Northwest Africa 12266 | |||||||||||||||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 824 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 | ||||||||||||||||||||||||||||||||
Writeup![]() |
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: |
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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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |