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Northwest Africa 11307
Basic information Name: Northwest Africa 11307
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11307
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 5.19 kg
Meteoritical Bulletin:  MB 106  (2018)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 240 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 13 Oct 2017
Writeup from MB 106:

Northwest Africa 11307 (NWA 11307)

(Northwest Africa)

Purchased: 2017 Feb

Classification: Mesosiderite

History: Purchased by Ben Hoefnagels in February 2017 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Annealed polymict breccia consisting predominantly of orthopyroxene, anorthite, metal (~25 vol.%; kamacite + minor taenite), exsolved pigeonite and troilite, with accessory silica polymorph, chromite and ilmenite.

Geochemistry: Orthopyroxene (Fs24.1-29.3Wo2.2-1.3, FeO/MnO = 30-35, N = 4), orthopyroxene host (Fs61.3Wo1.1, FeO/MnO = 30), clinopyroxene exsolution lamellae (Fs28.1-29.9Wo41.6-39.8, FeO/MnO = 29-30, N = 2), plagioclase (An91.3-92.6Or0.3-0.2, N = 2).

Classification: Mesosiderite (eucrite bearing). The abundance of metal, orthopyroxene, anorthite and troilite is consistent with the mineralogy of mesosiderites; however, the amounts of exsolved pigeonite, silica polymorph and ilmenite are indicative of a significant eucrite component. Furthermore, the compositions of the host orthopyroxene and clinopyroxene lamellae in exsolved pigeonite are typical of those in most eucrites.

Specimens: 124.8 g including one polished endcut at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2017 Feb
Mass (g):5194
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):24.1-29.3
Wollastonite (mol%):2.2-1.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):124.8
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH095; submitted by A. Irving
   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)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Public domain photographs:
A. Irving   

     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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