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Northwest Africa 7677
Basic information Name: Northwest Africa 7677
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7677
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 280 g
Meteoritical Bulletin:  MB 102  (2013)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 507 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 3 Jun 2013
Writeup from MB 102:

Northwest Africa 7677 (NWA 7677)

(Northwest Africa)

Purchased: 2012 Aug

Classification: HED achondrite (Diogenite)

History: Purchased by Eric Twelker in August 2012 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh specimen with cataclastic or mortar texture. Composed predominantly of orthopyroxene (Fs24.8-25.3Wo4.8-4.3, FeO/MnO = 27-29) with accessory clinopyroxene (Fs11.2-11.3Wo44.0-43.6, FeO/MnO = 19-20), anorthite, chromite, troilite and slightly stained Ni-free metal.

Geochemistry: Orthopyroxene (Fs24.8-25.3Wo4.8-4.3, FeO/MnO = 27-29), clinopyroxene (Fs11.2-11.3Wo44.0-43.6, FeO/MnO = 19-20).

Classification: Diogenite. Although no olivine was found in the studied thin section, this specimen is likely paired with NWA 7464, NWA 7599 and other stones from the same find site.

Specimens: A total of 23.3 g of sample and one polished thin section are on deposit at UWB. The remaining material is held by Twelker.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2012 Aug
Mass (g):280
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):24.8-25.3; 11.2-11.3
Wollastonite (mol%):4.8-4.3; 44.0-43.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):23.3
Type spec location:UWB
Main mass:E. Twelker
Comments:ET13-2; 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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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