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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 53 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   
Charley Kettel   
Dirk Hohmann   
Michael Hofmann   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7472 approved meteorites from (Northwest Africa) (plus 1988 unapproved names)

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