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Northwest Africa 4766
Basic information Name: Northwest Africa 4766
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4766
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 290 g
Classification
  history:
Recommended:  Martian    [explanation]

This is 1 of 3 approved meteorites classified as Martian.   [show all]
Search for other: Martian meteorites
Comments: Approved 6 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 4766 (NWA 4766)

(Northwest Africa)

Purchased: 2007

Classification: Martian meteorite

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

Physical characteristics: Fifteen grayish fragments partly covered with fusion crust.

Petrography: The meteorite shows a diabasic texture of predominantly up to 2 mm sized pigeonite and augite and equally sized maskelynite grains. Pyroxenes display complex patchy compositional zoning and often contain fine exsolution lamellae. Minor phases include ilmenite often intergrown with titanomagnetite, merrillite, and pyrrhotite. The meteorite is highly shocked and contains abundant shock melt veins and pockets.

Geochemistry: pigeonite: Fs41.7±5.1Wo13.0±2.2 (Fs32.9-50.1Wo9.0-17.7, n=15, FeO/MnO=29-38); augite: Fs25.7±1.9Wo31.7±2.3 (Fs23.8-29.2Wo28.7-35.2, n=12, FeO/MnO=27-33); maskelynite: An53.5±2.0Ab44.5±1.9Or2.0±0.4, n=14

Classification: Martian (diabasic shergottite)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tagounite, Morocco
Date:P 2007
Mass (g):290
Pieces:15
Class:Martian
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):41.7; 25.7
Wollastonite (mol%):13.0; 31.7
Classifier:A. Greshake, MNB
Type spec mass (g):20
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)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Martin Altmann         
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
collectionspace   
Gerald Armstrong      
MeteoriteCollector.org - FCOM - Russ Finney   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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