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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:help 223 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Diogenite-an
Recommended:  Diogenite-an    [explanation]

This is 1 of 4 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 31 Jan 2012
Writeuphelp
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 Fs33.4-34.1Wo2.5-1.2 (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)
Find references in NASA ADS:
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Photos:
CreditPhotos
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 6916 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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