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Northwest Africa 5471
Basic information Name: Northwest Africa 5471
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5471
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 538 g
Classification
  history:
Recommended:  Brachinite    [explanation]

This is 1 of 55 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 10 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 5471 (NWA 5471)

(Northwest Africa)

Purchased: 2008

Classification: Primitive achondrite (Brachinite)

History: The meteorite was purchased from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Twenty-one brownish fragments without fusion crust.

Petrography: The meteorite shows an equilibrated texture (120° triple junctions) and is predominantly composed of olivine (>90 vol.%) and Ca-pyroxene. Grains sizes of the silicates vary between 200 and 1000 μm. Accessories include FeS and FeNi metal. Feldspar and low-Ca pyroxene were not detected in the section studied. Metal is often replaced by alteration products decorating the grain boundaries and cracks are filled with terrestrial clacite.

Geochemistry: olivine: Fa28.3±0.1 (Fa28.0-28.5, FeO/MnO=57±2, n=14); Ca-pyroxene: Fs9.5±0.3Wo43.6±0.3 (Fs8.9-9.8Wo43.4-44.3, n=16)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2008
Mass (g):538
Pieces:21
Class:Brachinite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):28.3
Ferrosilite (mol%):9.5
Wollastonite (mol%):43.6
Classifier:A. Greshake, MNB
Type spec mass (g):21
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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)
André Knöfel   
aranemac Photo added 19 Apr 2022
Charley Kettel Photo added 19 Apr 2022
Dirk Hohmann Photo added 19 Apr 2022
Michael Hofmann Photo added 19 Apr 2022
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8402 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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