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Northwest Africa 11950 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11950 This is an OFFICIAL meteorite name. Abbreviation: NWA 11950 Observed fall: No Year found: 2007 Country: (Northwest Africa) Mass: 1645 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 658 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||||||||||
Comments: | Approved 15 Sep 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11950 (NWA 11950) (Northwest Africa) Purchased: 2007 Jan Classification: Ureilite History: Purchased by D. DGregory in Tucson, Arizona. Type specimen is under the museum number M53446 Petrography: (B. C. Hyde, ROM, UWO) The meterorite is predominantly olivine and pigeonite with grain size generally ranging from 0.5 to 3 mm. Olivine grains have reduced rims and minor reduction is seen along pigeonite rims. All olivine grains contain Ca,Cr-rich inclusions likely composed of multiple phases. Metal is abundant along grain boundaries and within reduction rims. Both graphite and diamond are present (as determined by Raman spectroscopy). Geochemistry: Mineral Compositions and Geochemistry: SEM based quantitative EDS and WDS (B. C. Hyde, UWO, ROM): Olivine cores: Fa21.1±0.2 (n=15), 0.58±0.04 wt% Cr2O3, 0.28±0.03 wt% CaO. Pyroxene cores: Fs17.9±0.1Wo7.5±0.1 (n=15). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave δ17O = 3.909, 3.733; δ18O = 9.183, 8.885; Δ17O = -0.940, -0.958 per mil. Classification: Ureilite Specimens: Currently includes the main mass, type material, two thin sections and one thick section. | ||||||||||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||
Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015) UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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