Meteoritical Bulletin: Entry for Northwest Africa 5766

header

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 13 Sep 2024
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 5766

Basic information

Name: Northwest Africa 5766
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5766
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 298 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	Mesosiderite-an
Recommended:			Mesosiderite-an [explanation]

This is 1 of 7 approved meteorites classified as Mesosiderite-an. [show all]
Search for other: Mesosiderites, Metal-rich meteorites

Comments:

Approved 14 Mar 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 5766 (NWA 5766)

(Northwest Africa)

Purchased: 2005

Classification: Mesosiderite (anomalous)

History: Purchased by Fabien Kuntz in 2005 from a dealer in Midelt, Morocco.

Physical characteristics: A group of small brown stones (total weight 298 g). Fresher interiors are gray with visible partly altered metal.

Petrography: (A. Irving and S. Kuehner, UWS) Aggregate of predominantly calcic plagioclase (~35 vol%), unexsolved pigeonite and altered kamacite (25 vol.%) with minor orthopyroxene, augite, silica polymorph, taenite and rare schreibersite. Thin iron hydroxide veinlets are present.

Geochemistry: Pigeonite (Fs_37.4-37.7Wo_10.3-8.7, FeO/MnO = 26-27, N = 3, orthopyroxene (Fs_36.1Wo_1.4, FeO/MnO =21), augite (Fs_20.6Wo_39.3, FeO/MnO = 19), plagioclase An_931.3-92.4Or_0.4(N=2).

Classification: Mesosiderite, anomalous . The dominant pyroxene is relatively magnesian pigeonite, which is anomalous for mesosiderites.

Specimens: 20.9 g including one polished piece at PSF; remaining material with Kuntz.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Midelt
Date:	P 2005
Mass (g):	298
Pieces:	many
Class:	Mesosiderite-an
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	36.1; 37.4-37.7
Wollastonite (mol%):	1.4; 10.3-8.7
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.9
Type spec location:	PSF
Main mass:	F. Kuntz
Comments:	K100; submitted by A. Irving

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)

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:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

Direct link to this page