Meteoritical Bulletin: Entry for Northwest Africa 6928

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Northwest Africa 6928

Basic information

Name: Northwest Africa 6928
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6928
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 223 g

Classification
history:

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

This is 1 of 9 approved meteorites classified as Diogenite-an. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 31 Jan 2012

Writeup

help

Writeup from MB 100:

Northwest Africa 6928 (NWA 6928)

(Northwest Africa)

Purchased: 2011 May

Classification: HED achondrite (Diogenite, anomalous)

History: Purchased in 2011 May by Gary Fujihara from a Moroccan dealer in Erfoud.

Physical characteristics: A single partly fusion-crusted stone weighing 223 g. The very fresh interior consists mainly of beige pyroxene and white plagioclase.

Petrography: Relatively coarse grained aggregate with cumulate texture composed of 80 vol.% orthopyroxene and 19 vol.% interstitial anorthitic plagioclase plus accessory Ti-Al-bearing chromite, troilite and merrillite.

Geochemistry: Orthopyroxene Fs_33.4-34.1Wo_2.5-1.2(Fe/Mn=31-33).

Classification: Achondrite (diogenite, noritic). This specimen consists of diogenitic orthopyroxene accompanied by an unusually high modal amount of plagioclase, and could be termed a noritic diogenite.

Specimens: A total of 20.9 g of material and one polished thin section is on deposit at UWS. Mr. G. Fujihara holds the main mass.

Data from:
  MB100
  Table 1
  Line 1544:

Place of purchase:	Erfoud
Date:	P 2011 May
Mass (g):	223
Pieces:	1
Class:	Diogenite-an
Shock stage:	low
Weathering grade:	very low
Ferrosilite (mol%):	33.4-34.1
Wollastonite (mol%):	2.5-1.2
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.9
Type spec location:	UWS
Main mass:	G. Fujihara
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)

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)
Andreas Grünemeyer
bphd

Geography:

Coordinates:

Unknown.

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

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Revision
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