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Northwest Africa 12206
Basic information Name: Northwest Africa 12206
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12206
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 6.2 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 491 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 7 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12206 (NWA 12206)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ureilite

Physical characteristics: Small, irregularly shaped, dark-brown stone. Remnant crust on one face. No caliche or rust on surface. Sample includes a polished thin section.

Petrography: Predominantly olivine with minor reduction rims. Scattered low-Ca pyroxene grains throughout. Modal abundances: olivine approx. 90%; low-Ca pyroxenes approx. 5%; remainder is graphite.

Geochemistry: Olivine core: Fa17.5±0.8, FeO/MnO = 37.38 ± 5.45 (n=3). Olivine rim: Fa6.7±3.2, (n= 5). pigeonite: Fs14.0±2.5Wo5.6±0.8, (n=8) δ17O = 2.3 permil, δ18O = 7.0 permil, Δ17O = -1.364 permil.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2013 Feb
Mass (g):6.16
Pieces:1
Class:Ureilite
Fayalite (mol%):10.8±6.1
Ferrosilite (mol%):14.0±2.5
Wollastonite (mol%):5.6±0.8
Classifier:T. Kunihiro, E. Nakamura, T. Ota, R. Tanaka, OkaU
Type spec mass (g):2.56
Type spec location:ROM
Main mass:Gregory
Comments:Registered at ROM as M58178. Studied at OkaU as TSE-URE-M58178(R1); submitted by V. Di Cecco, ROM
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)
Gregory: 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6672 approved meteorites from (Northwest Africa) (plus 2024 unapproved names)

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