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Northwest Africa 11890
Basic information Name: Northwest Africa 11890
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11890
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 150.2 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 471 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 3 Aug 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11890 (NWA 11890)

(Northwest Africa)

Purchased: Nov 2016

Classification: Ureilite

Petrography: coarse-grained olivine with reduced rims (90%), pyroxene (<5%), Fe-rich metal, and carbon phases. Graphite, metal, and sulfide occur in veins around the olivines and pyroxenes. Olivines are up to 2 mm. Si glass, graphite, and diamonds were also identified.

Geochemistry: Mineral Compositions and Geochemistry: Olivine cores, Fa21.7±0.1; rims Fa8.2±4.0. Pyroxenes contain a varied texture with lighter and darker spots, which display differing compositions: brighter Fs9.3±1.8Wo30.4±4.6; darker, Fs12.6±2.5Wo9.3±1.7).

Classification: Ureilite

Specimens: 20.0 g including a thin section and polished mount at UWO.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P Nov 2016
Mass (g):150.2
Pieces:1
Class:Ureilite
Shock stage:low
Weathering grade:low
Fayalite (mol%):21.7±0.1 (N=10, core); 8.2±4.0 (N=10, rim)
Ferrosilite (mol%):12.6±2.5 (N=10); 9.3±1.9 (N=10)
Wollastonite (mol%):9.3±1.7 (N=10); 30.4±4.6 (N=10)
Classifier:M. Spencer, UWO
Type spec mass (g):20.0
Type spec location:UWO
Main mass:S. Tutorow
Comments:G690 as a field name.; submitted by A. Bouvier
Institutions
   and collections
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Mike Markowitz   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6423 approved meteorites from (Northwest Africa) (plus 2023 unapproved names)

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