Meteoritical Bulletin: Entry for Northwest Africa 12206

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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: 6.2 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Ureilite
Recommended:			Ureilite [explanation]

This is 1 of 604 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 7 Mar 2019

Writeup

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: Fa_17.5±0.8, FeO/MnO = 37.38 ± 5.45 (n=3). Olivine rim: Fa_6.7±3.2, (n= 5). pigeonite: Fs_14.0±2.5Wo_5.6±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:	DGregory
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)
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8394 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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