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Northwest Africa 11950
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:help 1645 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 572 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 15 Sep 2018
Writeuphelp
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:
Place of purchase:Tucson
Date:P 2007 Jan
Mass (g):1645
Pieces:1
Class:Ureilite
Weathering grade:moderate
Fayalite (mol%):21.1±0.2 (N=15)
Ferrosilite (mol%):17.9±0.1 (N=15)
Wollastonite (mol%):7.5±0.1 (N=15)
Classifier:B. C. Hyde, ROM, UWO
Type spec mass (g):40
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by B. C. Hyde
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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