Meteoritical Bulletin: Entry for Northwest Africa 12208

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 19 Mar 2023
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 12208

Basic information

Name: Northwest Africa 12208
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12208
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 282 g

Classification
history:

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

This is 1 of 623 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 7 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 12208 (NWA 12208)

(Northwest Africa)

Purchased: 2013 Feb

Classification: Ureilite

Physical characteristics: Ovoid, dark-brown stone with weathered fusion crust on one surface. The other surfaces are wind-ablated. Minor caliche and rust on surface. Sample includes polished thin section and billet.

Petrography: Predominantly olivine with significant reduction rims visible. Gypsum was noted in some cracks indicating terrestrial weathering however there is only minor iron staining apparent in the mineral grains. Modal abundances: olivine approx. 70%; graphite approx. 20%; the remainder is scattered low-Ca pyroxene grains.

Geochemistry: Olivine: Fa_14.0±4.3(n=8); Olivine core: Fa_16.0±2.6(n=6); Olivine rim: Fa_8.2±1.4(n=2). Augite: Fs_5.5±0.1Wo_24.5±0.4, (n=2). Pigeonite: Fs_14.2±3.1Wo_8.7±1.5(n=10. δ¹⁷O = 2.71 permil, δ¹⁸O = 7.5 permil, Δ¹⁷O = -1.20 permil.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tucson Gem and Mineral Show
Date:	P 2013 Feb
Mass (g):	281.88
Pieces:	1
Class:	Ureilite
Fayalite (mol%):	14.0±4.3
Ferrosilite (mol%):	5.5±0.1; 14.2±3.1
Wollastonite (mol%):	24.5±0.4; 8.7±1.5
Classifier:	T. Kunihiro, E. Nakamura, T. Ota, R. Tanaka, OkaU
Type spec mass (g):	21.64
Type spec location:	ROM
Main mass:	DGregory
Comments:	Registered at ROM as M58060. Studied at OkaU as TSE-URE-M58060(R3); 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:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

Direct link to this page