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Northwest Africa 10955
Basic information Name: Northwest Africa 10955
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10955
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 27.3 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 629 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 17 Dec 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10955 (NWA 10955)

(Northwest Africa)

Purchased: 2016 May

Classification: Ureilite

History: Purchased by Ben Hoefnagels in May 2016 from a dealer in Ouarzazate, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate of subequal amounts of olivine (with dark, metal-rich rims) and pyroxene (some exhibiting polysynthetic twinning). Some of the pyroxene is augite and the low-Ca pyroxene could be either orthopyroxene or pigeonite.

Geochemistry: Olivine (cores Fa12.5-12.8, rim Fa6.7, N = 3), low-Ca pyroxene (Fs11.0-11.1Wo4.7-4.8, N = 2), augite (Fs6.3-6.6Wo37.3-36.9, N = 2).

Classification: Ureilite. The rather magnesian olivine, lack of typical more calcic pigeonite, and presence of both low-Ca pyroxene and augite are anomalous features.

Specimens: 6.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Ouarzazate
Date:P 2016 May
Mass (g):27.25
Pieces:1
Class:Ureilite
Shock stage:high
Weathering grade:low
Fayalite (mol%):12.5-12.8
Ferrosilite (mol%):11.0-11.1; 6.3-6.6
Wollastonite (mol%):4.7-4.8; 37.3-36.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):6
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:BH019; submitted by A. Irving
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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