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Northwest Africa 5400
Basic information Name: Northwest Africa 5400
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5400
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 4.82 kg
Classification
  history:
Meteoritical Bulletin:  MB 95  (2009)  Brachinite-like
Recommended:  Achondrite-ung    [explanation]

This is 1 of 84 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 23 Dec 2008
Revised 17 Apr 2009: final classification
Writeuphelp
Writeup from MB 95:

Northwest Africa 5400

Algeria

Find: June 2008

Achondrite (brachinite-like, ungrouped)

History: Purchased by Greg Hupé in June 2008 from a dealer in Er Rachidia, Morocco.

Physical characteristics: A single dense, dark brown, rounded stone (4818 g) is about half covered with weathered fusion crust and exhibits several narrow fractures. Dimensions are 19.5 cm × 16.0 cm × 9.7 cm. Petrography: (A. Irving and S. Kuehner, UWS) Coarse-grained rock (mostly 0.2–0.8 mm) with protogranular texture, composed predominantly of olivine (79 vol%) with subordinate orthopyroxene (10.5 vol%), clinopyroxene (8.9 vol%), chromite (1.4 vol%), Cl-rich apatite, troilite, kamacite (altered to iron hydroxides) and minor taenite. No plagioclase was observed despite a careful search.

Geochemistry: Olivine (Fa30.1–30.4, FeO/MnO = 56.1–70.8), clinopyroxene (Fs9.4Wo45.1, FeO/MnO = 25.5, Cr2O3 = 0.74 wt%, Al2O3 = 0.74 wt%), orthopyroxene (Fs24.4Wo2.1, FeO/MnO = 34.2), chromite [Cr/(Cr+Al) = 0.821, Mg/ (Mg+Fe) = 0.236, TiO2 = 1.4 wt%, ZnO = 0.30 wt%].

Oxygen isotopes (D. Rumble, CIW): clean, acid-washed silicate material from two separate portions of the type specimen analyzed in duplicate by laser fluorination at different times gave consistent results: respectively, δ18O = 5.061, 5.223, 4.486, 4.880; δ17O = 2.681, 2.741, 2.367, 2.525; Δ17O = 0.019, −0.006, 0.008, −0.042 per mil.

Classification: Achondrite (brachinite-like, ungrouped). In texture, mineral assemblage and mineral compositions, NWA 5400 is similar to brachinites, but the oxygen isotopic compositions plot essentially on the terrestrial fractionation line.

Specimens: A total of 22.4 g of sample and one polished thin section are on deposit at UWS. Mr. G. Hupé holds the main mass.

Data from:
  MB95
  Table 2
  Line 113:
Place of purchase:Morocco
Date:2008
Mass (g):4818
Pieces:1
Class:Brachinite-like
Fayalite (mol%):30.1-30.4
Ferrosilite (mol%):24.4
Wollastonite (mol%):2.1
Classifier:T. Irving, UWS
Type spec mass (g):22.4
Type spec location:UWS
Main mass:GHupé
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. 95, MAPS 44, 429-462 (2009)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
John A. Shea   
Russ Opdahl   
Solar Anamnesis   
Wandering Star   
Wang Ziyao      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6759 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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