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Northwest Africa 11951
Basic information Name: Northwest Africa 11951
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11951
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 205 g
Meteoritical Bulletin:  MB 107  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 15 Sep 2018
Writeup from MB 107:

Northwest Africa 11951 (NWA 11951)

(Northwest Africa)

Purchased: 2014 Jan

Classification: Ureilite

History: Purchased by D. DGregory in Tucson, Arizona. Designated as DGR-001-14. Type specimen is under the museum number M58189

Petrography: (B. C. Hyde, ROM, UWO) The meteorite is predominantly olivine and pigeonite. Grains can be as large as 3 mm, but regions of small grains (10s to 100s of μm) are also common. Olivine grains have reduced rims. The smallest olivine grains often show reduction throughout the entire grain. Minor reduction is also seen along pigeonite rims. Metal is abundant along grain boundaries and within reduction rims. The meteorite has a high abundance of diamond. Graphite is also present (as determined by Raman spectroscopy). Minor phases include chromite (10s of microns).

Geochemistry: Mineral Compositions and Geochemistry: SEM based quantitative EDS and WDS (B. C. Hyde, UWO, ROM): Olivine cores: Fa19.6±0.2 (n=14), 0.72±0.02 wt% Cr2O3, 0.30±0.01 wt% CaO. Pyroxene cores: Fs17.1±0.1Wo5.4±0.1 (n=17). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave δ17O = 3.861, 3.832; δ18O = 8.834,8.670; Δ17O = -0.803, -0.746 per mil.

Classification: Ureilite

Specimens: Currently includes the main mass, type material, one thin section and one thick section.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2014 Jan
Mass (g):205
Weathering grade:moderate
Fayalite (mol%):19.6±0.2 (N=14)
Ferrosilite (mol%):17.1±0.1 (N=17)
Wollastonite (mol%):5.4±0.1 (N=17)
Classifier:B. C. Hyde, ROM, UWO
Type spec mass (g):20
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by B. C. Hyde
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8509 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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