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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 118 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   
Domjan Svilkovic   
John A. Shea Photo added 19 Apr 2022
Russ Opdahl   
Solar Anamnesis         
Wandering Star Photo added 19 Apr 2022
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8394 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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