NWA 11809

 

 

NWA 11809

Found 2020

Achondrite, Lunar

Feldspathic

Specimen is a 1.34g slice

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 "BrecciaNWA 11223/11809 is 1 of only 5 lunar meteorites that I know to have a significant (Ce/Ce* <0.8) negative cerium (Ce) anomaly. All are from Northwest Africa (other 4: NWA 10318, NWA 10495, NWA 11182, and Tichiya).  Curiously, the meteorite does not appear to be weathered more than most NWA lunar meteorites. Perhaps related, the Eu concentration is unusually high (Eu/Sm is 1.6x and Eu/Na is 1.2x greater than other meteorites of similar composition)."

                                                                                                                 Randy Korotev


 


 

Northwest Africa 11809
Basic information Name: Northwest Africa 11809
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11809
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 67 g
Classification
  history:
Meteoritical Bulletin:   MB 107   (2018)   Lunar (feldsp. breccia)
Recommended:   Lunar (feldsp. breccia)   ]

This is 1 of 329 approved meteorites classified as Lunar (feldsp. breccia).
Comments: Approved 28 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11809 (NWA 11809)

(Northwest Africa)

Purchased: 2017 Sep

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Fabien Kuntz in September 2017 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral clasts of anorthite, olivine, orthopyroxene, pigeonite, subcalcic augite and Ti-chromite in a finer grained matrix containing minor barite.

Geochemistry: Olivine (Fa30.0-41.3, FeO/MnO = 87-97, N = 3), orthopyroxene (Fs35.7Wo4.2, FeO/MnO = 56), pigeonite (Fs25.2-29.8Wo7.9-10.1, FeO/MnO = 52-63, N = 2), subcalcic augite (Fs15.8Wo30.1, FeO/MnO = 56), anorthite (An92.0-95.0Or0.2-0.1, N = 2).

Classification: Lunar (feldspathic breccia).

Specimens: 14.11 g including a polished slice at UWB; main mass with Kuntz.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase: Erfoud
Date: P 2017 Sep
Mass (g): 67
Pieces: 1
Class: Lunar (feldsp. breccia)
Shock stage: low
Weathering grade: low
Fayalite (mol%): 30.0-41.3
Ferrosilite (mol%): 25.2-35.7
Wollastonite (mol%): 7.9-4.2
Classifier: A. Irving and S. Kuehner, UWS
Type spec mass (g): 14.11
Type spec location: UWB
Main mass: F. Kuntz
Comments: K371; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Kuntz: Fabien Kuntz, France; Website (private address)

 

 

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