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Northwest Africa 12207
Basic information Name: Northwest Africa 12207
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12207
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 93.8 g
Meteoritical Bulletin:  MB 108  (2020)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 7 Mar 2019
Writeup from MB 108:

Northwest Africa 12207 (NWA 12207)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ureilite

Physical characteristics: Ovoid, dark-brown stone with minor fusion crust. No caliche or rust on surface. Sample includes a polished thin section and billet.

Petrography: Predominantly olivine. The largest aggregate of low Ca pyroxene is 2 mm. Reduction of olivine is present near graphite rich regions. Modal abundances: olivine approx. 75%; low Ca pyroxene approx. 20 %; the remainder is graphite.

Geochemistry: Olivine: Fa16.4±7.2 (n=4); Olivine core: Fa21.1±0.2 (n=2); Olivine rim: Fa11.7±8.3 (n=2). Pigeonite: Fs13.9±4.3Wo6.1±3.1 (n=5). δ17O = 3.06 permil, δ18O = 7.90 permil, Δ17O = -1.05 permil.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2013 Feb
Mass (g):93.8
Fayalite (mol%):16.4±7.2
Ferrosilite (mol%):13.9±4.3
Wollastonite (mol%):6.1±3.1
Classifier:T. Kunihiro, E. Nakamura, T. Ota, R. Tanaka, OkaU
Type spec mass (g):19.01
Type spec location:ROM
Main mass:DGregory
Comments:Registered at ROM as M58176. Studied at OkaU as TSE-URE-M58176(R2); submitted by V. Di Cecco, ROM
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8509 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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