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Northwest Africa 11720
Basic information Name: Northwest Africa 11720
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11720
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 230 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Pallasite, PMG-an
Recommended:  Pallasite, PMG-an    [explanation]

This is 1 of 16 approved meteorites classified as Pallasite, PMG-an.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 7 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11720 (NWA 11720)

(Northwest Africa)

Purchased: 2017 Jan

Classification: Pallasite (Main group, anomalous)

History: A batch of small metal-bearing stones (230 g) purported to have been found at the same site as NWA 10023 and NWA 10252 was purchased by Mike Bandli in January 2017 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Coarse grained aggregate of olivine and stained plessitic metal with rare accessory schreibersite.

Geochemistry: Olivine (Fa13.3-13.7, FeO/MnO = 47-53, N = 3).

Classification: Pallasite PMG-an. Likely paired with NWA 10023 and NWA 10252. Anomalous designation based on the presence of the same plessitic metal observed in the larger specimens, plus the fact that these stones were found with the previous specimens and purchased from the same Moroccan dealer.

Specimens: 20.2 g including one polished endcut at UWB; remainder with Mr. M. Bandli.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2017 Jan
Mass (g):230
Pieces:several
Class:Pallasite, PMG-an
Shock stage:low
Weathering grade:low
Fayalite (mol%):13.3-13.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:M. Bandli
Comments:Work name B386; 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. 107, MAPS 55, 460-462
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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