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Northwest Africa 7639
Basic information Name: Northwest Africa 7639
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7639
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 294 g
Meteoritical Bulletin:  MB 103  (2014)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 8 Nov 2014
Writeup from MB 103:

Northwest Africa 7639 (NWA 7639)

(Northwest Africa)

Purchased: 2008

Classification: HED achondrite (Diogenite)

History: Purchased by Philip Mani from a Moroccan dealer in 2008.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed mainly of large angular grains of orthopyroxene and olivine within a finer grained fragmental matrix containing the same minerals plus chromite, anorthite, clinopyroxene and troilite. Some polymineralic clasts contain olivine and plagioclase in contact with orthopyroxene, and in one there is a symplectitic intergrowth of chromite in orthopyroxene. The overall proportions of minerals are estimated to be ~80 vol.% orthopyroxene with ~15 vol.% olivine and ~5 vol.% plagioclase and others.

Geochemistry: Orthopyroxene (Fs23.3-24.6Wo1.8; FeO/MnO = 26-27), olivine (Fa28.7-28.8; FeO/MnO = 45-48), clinopyroxene (Fs7.5-8.0Wo46.5-45.8; FeO/MnO = 16-17).

Classification: Diogenite (monomict breccia). The relative proportions of olivine and plagioclase indicate that this specimen can be termed an olivine orthopyroxenitic diogenite.

Specimens: 41.1 g of material and one polished thin section are on deposit at UWBPMani holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2008
Mass (g):294.1
Shock stage:low
Weathering grade:low
Fayalite (mol%):28.7-28.8
Ferrosilite (mol%):23.3-24.6
Wollastonite (mol%):1.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):41.1
Type spec location:UWB
Main mass:P. Mani
Comments:PCM12-32; 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)
PMani: Philip Mani, 20726 Stone Oak Parkway, Suite 116, San Antonio, TX 78258 , United States (private address; updated 2 Jan 2010)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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