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Northwest Africa 5556
Basic information Name: Northwest Africa 5556
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5556
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 84.2 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 342 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Jul 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 5556 (NWA 5556)

(Northwest Africa)

Purchased: 2008

Classification: HED achondrite (Eucrite, polymict)

History: The meteorite was bought in 2008 from a Moroccan meteorite dealer on a mineral fair in St. Marie aux Mines, France.

Petrography: The meteorite is a polymict breccia of lithic and mineral clasts in a fine-grained clastic matrix. Lithic clasts include basaltic and impact melt clasts. Dominant minerals in clasts and matrix are exsolved pyroxenes and calcic plagioclase. Diogenitic orthopyroxene makes up about 4 vol.%. Minor phases are chromite and silica.

Geochemistry: Pyroxene host to augite lamellae: Fs50.2±0.6Wo1.9±0.3 (Fs49.5-51.3Wo1.6-2.6, n=14, FeO/MnO=29-35); Ca-pyroxene: Fs22.5±1.7Wo42.4±2.5 (Fs19.6-27.6Wo35.7-46.4, n=21, FeO/MnO=26-30); diogenitic pyroxene: Fs32.5±3.6Wo2.9±0.3 (Fs26.8-40.3Wo2.5-3.4, n=9, FeO/MnO=34-43); calcic plagioclase: An88.6±4.7 (An78.1-92.9, n=12)

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:St. Marie aux Mines, France
Date:P 2008
Mass (g):84.2
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):50.2; 22.5; 32.5
Wollastonite (mol%):1.9; 42.4; 2.9
Classifier:A. Greshake, MNB
Type spec mass (g):17.9
Type spec location:MNB
Main mass:Marc Jost
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Andreas Grünemeyer   
Space Jewels   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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