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Northwest Africa 7968
Basic information Name: Northwest Africa 7968
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7968
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 48 g
Meteoritical Bulletin:  MB 104  (2015)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 427 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 31 Dec 2015
Writeup from MB 104:

Northwest Africa 7968 (NWA 7968)

(Northwest Africa)

Purchased: 2011 Sep

Classification: HED achondrite (Howardite)

History: Purchased by Dr. David Gregory in September 2011 from a dealer at the Denver Show.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia consisting mostly of shocked diogenitic clasts plus ~30 vol.% eucritic clasts (with fine intersertal to gabbroic textures) and some angular grains of olivine (with variable composition). Diogenite clasts consist predominantly of orthopyroxene (exhibiting marked undulose extinction and strong cataclasis) with accessory chromite. Eucritic clasts consist of exsolved pigeonite and calcic plagioclase (mostly converted to maskelynite, but some polycrystalline) with accessory silica polymorph, ilmenite, Ti-chromite and troilite.

Geochemistry: Diogenitic orthopyroxene (Fs26.2-26.7Wo2.8-2.9, FeO/MnO = 30, N = 2), eucritic orthopyroxene host (Fs49.8Wo4.3, FeO/MnO = 32), clinopyroxene exsolution lamella(Fs20.6Wo44.0, FeO/MnO = 24), orthopyroxene (Fs42.7Wo4.1; Fs50.4Wo1.8, FeO/MnO = 30-31), augite (Fs28.6Wo39.7, FeO/MnO = 28), olivine (Fa36.6-48.1, FeO/MnO = 50-52, N = 3), plagioclase (An84.7Or0.6; An78.4Or1.3, N = 2).

Classification: Howardite (shocked).

Specimens: 11.55 g including one polished thin section and one polished mount at ROM; remainder with DGregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2011 Sep
Mass (g):48.01
Shock stage:high
Weathering grade:low
Fayalite (mol%):36.6-48.1
Ferrosilite (mol%):26.2; 49.8; 20.6
Wollastonite (mol%):2.8; 4.3; 44.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):11.55
Type spec location:ROM
Main mass:DGregory
Comments:ROM 067; submitted by A. Irving
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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