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Northwest Africa 5476
Basic information Name: Northwest Africa 5476
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5476
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 203 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 355 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 26 Sep 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 5476 (NWA 5476)

(Northwest Africa)

Purchased: 2008

Classification: HED achondrite (Eucrite, polymict)

History: The meteorite was bought in 2008 from a Moroccan meteorite dealer in Erfoud, Morocco.

Physical characteristics: Grayish individual partly covered by fusion crust.

Petrography: The meteorite is a fine-grained breccia composed of lithic and mineral fragments set into a clastic matrix. Lithic fragments include basaltic and dark impact melt clasts. Dominant minerals in clasts and matrix are exsolved pyroxene and calcic plagioclase up to 400 µm in size. Some matrix pyroxenes display magmatic zoning. Minor phases include chromite, ilmenite, silica, pyrrhotite and metallic iron. The meteorite contains shock melt veins.

Geochemistry: low-Ca pyroxene: Fs33.2±9.7Wo2.9±0.9 (Fs23.3-45.6Wo1.4-4.5, n=21, FeO/MnO=29-39); Ca-pyroxene: Fs20.8±1.7Wo40.5±2.7 (Fs17.5-27.4Wo34.7-44.5, n=18, FeO/MnO=26-33); calcic plagioclase: An85.9±4.0 (An77.3-91.9, n=15)

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2008
Mass (g):203
Pieces:1
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):33.2; 20.8
Wollastonite (mol%):2.9; 40.5
Classifier:A. Greshake, MNB
Type spec mass (g):20.2
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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
André Knöfel   
Andreas Grünemeyer   
Auricular   
DCOM   
Dirk Hohmann      
Jean-Michel Masson   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7820 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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