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Northwest Africa 6909
Basic information Name: Northwest Africa 6909
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6909
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 188 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 424 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 Nov 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6909 (NWA 6909)

Northwest Africa

Purchased: Nov 2009

Classification: HED achondrite (Eucrite)

Petrography: Dark greenish gray, compact stone with minor weathered fusion crust. Subophitic texture with blocky to lath shaped, calcic plagioclase grains partly enclosed within strongly zoned pigeonite. Accessory minerals include chromite, ulvöspinel intergrown with ilmenite, silica polymorph, troilite and Ni-free metal. Pyroxene grains have cores of relatively magnesian pigeonite (mantled by ferropigeonite) and in turn by symplectitic intergrowths of fayalite+hedenbergite+silica+ilmenite against plagioclase.

Geochemistry: Pigeonite cores Fs38.4-40.7Wo7.4-8.2, FeO/MnO=27, ferropigeonite mantles Fs71.0-79.1Wo20.6-17.3, FeO/MnO=36-39, plagioclase An83.4-91.4Or0.2-0.7. Oxygen isotopes (D. Rumble, CIW): duplicate analyses by laser fluorination of acid-washed subsamples gave, respectively δ17O=1.683, 1.647; δ18O=3.647, 3.600; Δ17O= -0.236, -0.247.

Data from:
  MB100
  Table 1
  Line 1530:
Place of purchase:Zagora
Date:P Nov 2009
Mass (g):188
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):38.4-40.7; 71.0-79.1
Wollastonite (mol%):7.4-8.2; 20.6-17.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWS
Main mass:G. Tomelleri
Comments:GT09-2; submitted by A. Irving
Plots: O isotopes:  
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)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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