Meteoritical Bulletin: Entry for Northwest Africa 11307

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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: 5.19 kg

Classification
history:

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

help

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 (Fs_24.1-29.3Wo_2.2-1.3, FeO/MnO = 30-35, N = 4), orthopyroxene host (Fs_61.3Wo_1.1, FeO/MnO = 30), clinopyroxene exsolution lamellae (Fs_28.1-29.9Wo_41.6-39.8, FeO/MnO = 29-30, N = 2), plagioclase (An_91.3-92.6Or_0.3-0.2, 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:
  MB106
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	P 2017 Feb
Mass (g):	5194
Pieces:	1
Class:	Mesosiderite
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

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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

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

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