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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 89 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:
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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)
David Hardy   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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