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Northwest Africa 12209
Basic information Name: Northwest Africa 12209
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12209
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 25 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 12209 (NWA 12209)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ureilite

Physical characteristics: Small, triangular, dark-brown stone with desert varnished surface. Minor caliche. Sample includes polished thin section and billet.

Petrography: Predominantly olivine with significant reduction rims. Graphite occurs along grain boundaries as well as in clots interstitial to the mineral grains. Modal abundances: olivine approx. 90%; 5% graphite; remainder is scattered low-Ca pyroxene grains.

Geochemistry: Olivine: Fa16.3±4.6 (n=7); Olivine core: Fa19.6±2.3 (n=4); Olivine rim: Fa11.8±1.6 (n=3). Augite: Fs4.5±2.3Wo30.0±8.4, (n=2). Pigeonite: Fs14.3±6.6Wo5.3±2.4 (n=16). δ17O = 3.402 permil, δ18O = 8.206 permil, Δ17O = -0.877 permil.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2013 Feb
Mass (g):24.95
Fayalite (mol%):16.3±4.6
Ferrosilite (mol%):4.5± 2.3; 14.3±6.6
Wollastonite (mol%):30.0±8.4; 5.3±2.4
Classifier:T. Kunihiro, E. Nakamura, T. Ota, R. Tanaka, OkaU
Type spec mass (g):5.34
Type spec location:ROM
Main mass:DGregory
Comments:Registered at ROM as M57447. Studied at OkaU as TSE-URE-M57447(R4); 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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