Meteoritical Bulletin: Entry for Northwest Africa 6709

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Northwest Africa 6709

Basic information

Name: Northwest Africa 6709
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6709
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 494 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Howardite-an
Recommended:			Howardite-an [explanation]

This is 1 of 2 approved meteorites classified as Howardite-an. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 31 Jan 2012

Writeup

Writeup from MB 100:

Northwest Africa 6709 (NWA 6709)

(Northwest Africa)

Purchased: March 2011

Classification: Howardite-an

Petrography: Fresh fragmental breccia composed mainly of basaltic eucrite clasts plus ~30 vol.% of distinctly yellow diogenite clasts and related orthopyroxene grains. Eucrite clasts contain exsolved pigeonite, shocked calcic plagioclase (most transformed to maskelynite, some polygranular), silica polymorph, ilmenite and troilite.

Geochemistry: Diogenitic orthopyroxene Fs_33.9-41.5Wo_1.1-3.1(Fe/Mn=30-35), orthopyroxene host Fs_48.8Wo_3.4(Fe/Mn=27), augite exsolution lamellae Fs_18.1-19.9Wo_41.6-39.9(Fe/Mn=25-28).

Classification: Achondrite (howardite, anomalous). This is an unusual specimen because the diogenitic orthopyroxene is notably ferroan, which probably accounts for its more yellow rather than green color. The specimen also is highly shocked.

Data from:
  MB100
  Table 1
  Line 1492:

Place of purchase:	Erfoud
Date:	P March 2011
Mass (g):	494
Pieces:	2
Class:	Howardite-an
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	48.8; 18.1-19.9
Wollastonite (mol%):	3.4; 41.6-39.9
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20
Type spec location:	UWS
Main mass:	S. Ralew
Comments:	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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
John Lutzon

Geography:

Coordinates:

Unknown.

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

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Revision
history:

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