MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 29 Jan 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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:help 424 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 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 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 (Fs60.6-60.7Wo2.5-2.6; FeO/MnO = 32-34), clinopyroxene exsolution lamellae (Fs26.2-27.2Wo43.5-42.1; 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:
  Table 0
  Line 0:
Place of purchase:Brügg, Switzerland
Date:P 2012 Jun
Mass (g):424
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
   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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

Direct link to this page