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Northwest Africa 4925
Basic information Name: Northwest Africa 4925
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4925
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 282 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 8 Sep 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 4925

Erfoud, Morocco

Find: 2007

Achondrite (Martian, olivine-phyric shergottite)

History: The meteorite was found by an anonymous person in northwest Africa and bought by the main mass holder in Erfoud, Morocco.

Physical characteristics: One fragment partly covered by fusion crust weighing 282.3 g was found.

Petrography: (A. Greshake, MNB) The meteorite displays a porphyritic texture with large chemically zoned olivine megacrysts set into a fine-grained groundmass composed of pyroxene and maskelynite. Minor phases include chromite, sulfides, phosphates, and small Fe-rich olivines. The olivine megacrysts often contain melt inclusions and small chromites.

Geochemistry: Mineral composition (EMPA): Olivine, Fa27.6–46.8; pyroxene, Fs20.0–37.7Wo3–14.8; maskelynite, An67–69.

Classification: Achondrite (Martian, olivine-phyric shergottite); severely shocked with some melt pockets; moderately weathered.

Specimens: A total of 20.1 g plus one polished thin section are on deposit at MNB. Ralew holds the main mass.

Data from:
  MB94
  Table 2
  Line 85:
State/Prov/County:Erfoud
Date:2007
Mass (g):282.3
Pieces:1
Class:Shergottite
Fayalite (mol%):27.6-46.8
Ferrosilite (mol%):20.0-37.7
Wollastonite (mol%):3-14.8
Classifier:A. Greshake, MNB
Type spec mass (g):20.1
Type spec location:MNB
Main mass:Ralew
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. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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