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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:help 282 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 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: Fa14.0±4.3 (n=8); Olivine core: Fa16.0±2.6 (n=6); Olivine rim: Fa8.2±1.4 (n=2). Augite: Fs5.5±0.1Wo24.5±0.4, (n=2). Pigeonite: Fs14.2±3.1Wo8.7±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:Gregory
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)
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:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

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

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