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Northwest Africa 7989
Basic information Name: Northwest Africa 7989
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7989
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 510 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Aug 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7989 (NWA 7989)

(Northwest Africa)

Purchased: 2013 Jul

Classification: HED achondrite (Eucrite, polymict)

History: Purchased in July 2013 by Mendy Ouzillou from a dealer in Morocco.

Physical characteristics: The stone (510 g) lacks fusion crust and has a weathered, brownish exterior; the interior consists of separated white and brownish clasts in a dark matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed predominantly of gabbroic eucrite clasts with some diabasic eucrite clasts in a sparse matrix of related debris. The grain size of pyroxene and plagioclase in gabbroic clasts ranges up to 1.4 mm. Primary minerals are exsolved pigeonite (with variable red-brown staining), calcic plagioclase (polycrystalline, birefringent), silica polymorph, ilmenite, Ti-bearing chromite, troilite and Ni-free iron metal; small amounts of secondary barite and calcite terrestrial weathering products are present.

Geochemistry: Orthopyroxene host (Fs60.9-62.3Wo2.1-2.2, FeO/MnO = 29-32), clinopyroxene exsolution lamellae (Fs26.9-27.5Wo43.4-42.6, FeO/MnO = 29-30), clinopyroxene host (Fs27.4Wo43.3, FeO/MnO = 29), orthopyroxene exsolution lamella (Fs63.7Wo3.4, FeO/MnO = 35).

Classification: Eucrite (polymict, gabbroic). This material is somewhat heterogeneous, but is notable for the relatively coarse grain size of eucrite clasts, the shocked plagioclase and the variable red-brown color of pyroxene.

Specimens: 21 g of material including one polished thin section at UWB. The main mass is held by M. Ouzillou.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2013 Jul
Mass (g):510
Pieces:1
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:moderate
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27
Type spec location:UWB
Main mass:M. Ouzillou
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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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)
Cosimo Damiano Gorgoglione   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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