Meteoritical Bulletin: Entry for Northwest Africa 8309

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Northwest Africa 8309

Basic information

Name: Northwest Africa 8309
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8309
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass: 424 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 6 Jun 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8309 (NWA 8309)

(Northwest Africa)

Purchased: 2012 Jun

Classification: HED achondrite (Eucrite)

History: Purchased from a Moroccan dealer in Brügg, Switzerland in June 2012 by Marc Jost.

Petrography: (A. Irving and S. Kuehner, UWS) This fresh specimen exhibits a cataclastic structure with larger and smaller domains, all of which retain the primary texture of an extremely fine grained (0.02 to 0.2 mm), intersertal igneous rock. Minerals are exsolved pigeonite, calcic plagioclase, silica polymorph, Ti-chromite, ilmenite (in parallel growth with Ti-poor chromite), troilite and zircon.

Geochemistry: Host orthopyroxene (Fs_60.6-60.7Wo_2.5-2.6; FeO/MnO = 32-34), clinopyroxene exsolution lamellae (Fs_26.2-27.2Wo_43.5-42.1; FeO/MnO = 32).

Classification: Eucrite, basaltic, cataclastic. The primary basaltic eucrite lithology is unusually fine grained.

Specimens: 21.2 g including one polished thin section at UWB. The remaining material is held by Mr. M. Jost.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Brügg, Switzerland
Date:	P 2012 Jun
Mass (g):	424
Pieces:	1
Class:	Eucrite
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	60.6-60.7; 26.2-27.2
Wollastonite (mol%):	2.5-2.6; 43.5-42.1
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	21.2
Type spec location:	UWB
Main mass:	M. Jost
Comments:	SJS12004; 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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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