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Northwest Africa 4478
Basic information Name: Northwest Africa 4478
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4478
Observed fall: No
Year found: 2006
Country: Algeria
Mass:help 444 g
Classification
  history:
Meteoritical Bulletin:  MB 92  (2007)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 78 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 24 Jul 2007
Writeuphelp
Writeup from MB 92:

Northwest Africa 4478

Algeria

Find: September 2006

Achondrite (lodranite)

History: G. Hupé purchased the sample in September 2006 in Zagora, Morocco.

Physical characteristics: Two dense, brown stones (298 g and 146 g) lacking fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) This specimen is composed of large mineral and polycrystalline lithologies (up to 8 mm across) with interstitial fine-grained material of the same phases.The large minerals consist of either olivine or orthopyroxene (with clinopyroxene exsolution lamellae associated with blebs of Ni-free iron metal). The polycrystalline lithology consists mainly of interlocking olivine grains (up to 3 mm across) and sparse large chromite grains with interstitial clinopyroxene, orthopyroxene, kamacite, pyrrhotite, pentlandite and troilite. The modal abundance of metal (+ limonite after primary metal) is 5 vol%. Plagioclase is absent. Olivine grains contain numerous blebby to worm-like polycrystalline inclusions, and clinopyroxene grains contain similar inclusions; some examples exhibit symplectitic intergrowths of these various phases. Some olivine grains contain multiple blade-like lamellae of olivine of a different composition. Narrow elongate zones or discontinuous veinlets of metal are present within clinopyroxene, and adjacent to such metal the pyroxene has a more magnesian composition.

Mineral compositions and geochemistry: Olivine (Fa10.6-10.9; FeO/MnO = 22.1-23.9), clinopyroxene (Fs3.9Wo41.9; FeO/MnO = 10.2), orthopyroxene lamella in clinopyroxene (Fs9.1Wo1.3; FeO/MnO = 11.9) and chromite (Cr/(Cr+Al) = 0.822-0.825; Mg/(Mg+Fe) = 0.506 - 0.520, TiO2 = 0.31-0.37 wt%). Oxygen Isotopes: (D. Rumble, CIW) Quadruplicate analyses by laser fluorination gave, respectively, δ18O = 2.23, 2.43, 2.23, 2.40; δ17O = 0.14, 0.30, 0.07, 0.11; Δ17O = -1.034, -0.984, -1.107, -1.147 (all ‰).

Classification: Achondrite (lodranite).

Type specimens: A total of 20.1 g of sample and one polished thin section are on deposit at UWS. GHupé holds the main mass.

Data from:
  MB92
  Table 2
  Line 76:
Place of purchase:Algeria, Morocco
Date:Sep-2006
Mass (g):444
Pieces:2
Class:Lod
Type spec mass (g):20.1
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)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
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)
abibou   
bphd   
David Hardy   
Gerald Armstrong   
Michael S. Scherman      
Volker Heinrich   
Woreczko Jan & Wadi   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 946 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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