Meteoritical Bulletin: Entry for Northwest Africa 12207

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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: 93.8 g

Classification
history:

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

This is 1 of 630 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 7 Mar 2019

Writeup

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: Fa_16.4±7.2(n=4); Olivine core: Fa_21.1±0.2(n=2); Olivine rim: Fa_11.7±8.3(n=2). Pigeonite: Fs_13.9±4.3Wo_6.1±3.1(n=5). δ¹⁷O = 3.06 permil, δ¹⁸O = 7.90 permil, Δ¹⁷O = -1.05 permil.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tucson Gem and Mineral Show
Date:	P 2013 Feb
Mass (g):	93.8
Pieces:	1
Class:	Ureilite
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:

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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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