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Northwest Africa 4223
Basic information Name: Northwest Africa 4223
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4223
Observed fall: No
Year found: 2005
Country: Algeria
Mass:help 329 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Diogenite-olivine
Recommended:  Diogenite    [explanation]

This is 1 of 430 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4223

Algeria

Find: December 2005

Achondrite (diogenite, olivine-bearing)

History: G. Hupé purchased the stones in December 2005 in Tagounite, Morocco.

Physical characteristics: The meteorite comprises two dense, dark brown and partly fusion crusted stones with a total weight of 329 g.

Petrography: (A. Irving and S. Kuehner, UWS) The meteorite is coarse-grained (≤ 4 mm) with a primarily protogranular texture, and some areas of cataclasis. Olivine (50 vol%) and orthopyroxene (45 vol% ) are the dominant minerals with accessory chromite, troilite and metal (kamacite). Some veinlets of terrestrial calcite crosscut the specimen.

Mineral compositions and geochemistry: Olivine (Fa30.0-31.2; FeO/MnO = 44.8-48.2), orthopyroxene (Fs24.2-25.2Wo2.8-3.2; FeO/MnO = 28.8), chromite (Cr/(Cr+Al) = 0.703-0.715; Fe/(Fe+Mg) = 0.69-0.73, mean TiO2 = 1.02 wt%).Oxygen Isotopes: (D. Rumble, CIW) Analyses of two aliquots by laser fluorination gave, respectively, δ18O = 3.08, 3.22; δ17O = 1.44, 1.48; Δ17O = -0.180, -0.214 (all ‰).

Classification: Achondrite (diogenite, olivine-bearing).

Type specimens: A total of 20.4 g of sample, one polished thin section and a polished mount are on deposit at UWS. Hupé holds the main mass.

Data from:
  MB92
  Table 2
  Line 13:
Place of purchase:Algeria
Date:Dec-2005
Mass (g):329
Pieces:2
Class:Dio
Type spec mass (g):24
Plots: O isotopes:  
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)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
The Hupe Collection   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
André Knöfel   
Andreas Grünemeyer   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 979 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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