Meteoritical Bulletin: Entry for Northwest Africa 12209

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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: 25 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 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: Fa_16.3±4.6(n=7); Olivine core: Fa_19.6±2.3(n=4); Olivine rim: Fa_11.8±1.6(n=3). Augite: Fs_4.5±2.3Wo_30.0±8.4, (n=2). Pigeonite: Fs_14.3±6.6Wo_5.3±2.4(n=16). δ¹⁷O = 3.402 permil, δ¹⁸O = 8.206 permil, Δ¹⁷O = -0.877 permil.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tucson Gem and Mineral Show
Date:	P 2013 Feb
Mass (g):	24.95
Pieces:	1
Class:	Ureilite
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:

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

Find references in NASA ADS:
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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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