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Northwest Africa 4929
Basic information Name: Northwest Africa 4929
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4929
Observed fall: No
Year found: 2007
Country: Morocco
Mass:help 1214 g
Classification
  history:
Recommended:  Brachinite    [explanation]

This is 1 of 48 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 18 Aug 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 4929 (NWA 4929)

Morocco

Find: 2007

Classification: Primitive achondrite (Brachinite)

History: Two pieces purchased in July and a third one in September 2007 in Erfoud, Morocco.

Physical characteristics: One complete stone broken into three pieces that fit together (weathered fracture), for a total weight of 1214 g (263+371+580). Partly covered with a slightly weathered, dark-brown fusion crust.

Petrography: A. Jambon, O. Boudouma and D. Badia; (UPVI) Mineral mode (from BSE imaging) Olivine 88% orthopyroxene 6.5%, augite 1%, chromite 2.3% and plagioclase 1.7%. Accessories include weathered kamacite and Ni rich metal. Typical polygonal granular texture; grain size 0.2-0.4 mm.

Geochemistry: Olivine Fa33±1, FeO/MnO = 66 (n=24). Orthopyroxene En70Fs27Wo2 FeO/MnO = 41, augite En46Fs11Wo44 FeO/MnO = 28, chromite Cr/(Cr+Al) = 0.79, Mg/(Mg+Fe)=0.22 and TiO2 = 1.05 wt%. Plagioclase An30. Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of two acid-washed 1.5 mg aliquots of a powdered 70 mg bulk sample is δ17O=2.49‰, δ18O=5.33‰, Δ17O=-0.30‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively).

Classification: Achondrite (Brachinite)

Specimens: A total of 20.2 g of sample and one polished section is on deposit at UPVI. Moroccan Import Asnières, France holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:2007
Mass (g):1214
Pieces:3
Class:Brachinite
Weathering grade:signific
Fayalite (mol%):33±1 (n=24)
Ferrosilite (mol%):27±1 (n=30)
Wollastonite (mol%):2.3±0.1 (n=30)
Classifier:A. Jambon, O. Boudouma, D. Badia (UPVI); J. Gattacecca, C. Sonzogni (CEREGE)
Type spec mass (g):20.2
Type spec location:UPVI
Main mass:Moroccan Import, Asnières, France
Comments:Submitted by Albert Jambon
Plots: O isotopes:  
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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)
Mohammed HMANI   
Public domain photographs:
Albert Jambon   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1390 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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