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Northwest Africa 12433
Basic information Name: Northwest Africa 12433
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12433
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 69 g
Meteoritical Bulletin:  MB 108  (2020)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 666 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 16 Feb 2019
Writeup from MB 108:

Northwest Africa 12433 (NWA 12433)

(Northwest Africa)

Purchased: 2017

Classification: Ureilite

History: Specimen was purchased from Mirko Graul in 2017.

Physical characteristics: Exterior of rock is light brown with dark-gray patches of what appears to be remnant fusion crust; interior is dark gray and has coarse silicates, with almost no metal or sulfide visible.

Petrography: (A. Ruzicka, J. Graham-Davis) Contains olivine and pigeonite grains up to 1-2 mm across. Areas opaque in transmitted light occur interstitial to olivine and pyroxene and cross-cut these grains. Opaque areas are largely filled by weathering products or other fine-grained material and feature tabular to acicular grains of graphite up to 200 μm long.

Geochemistry: Mineral compositions and geochemistry: (M. Hutson, A. Ruzicka) Olivine grains have homogenous, ferroan cores (Fa22.5±0.2, N = 18) and more magnesian rims (Fa15.2±2.3, N = 18), low Ca-pyroxene is relatively homogenous (Wo9.5±0.0,Fs18.8±0.1, N = 15).

Classification: ureilite

Specimens: Cascadia holds 17.0 g in one piece, in addition to a polished thin section and a mounted butt. John Shea holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2017
Mass (g):69
Fayalite (mol%):22.5±0.2, 15.2±2.3
Ferrosilite (mol%):18.8±0.1
Wollastonite (mol%):9.5±0.0
Classifier:A. Ruzicka, J. Graham-Davis, M. Hutson, Cascadia
Type spec mass (g):17.0
Type spec location:Cascadia
Main mass:John Shea
Comments:Lab number CML 0975.; submitted by Alex Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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