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Northwest Africa 6256
Basic information Name: Northwest Africa 6256
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6256
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 500 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 195 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 4 Mar 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 6256 (NWA 6256)

(Northwest Africa)

Purchased: 2009

Classification: Mesosiderite

History: The meteorite was bought in 2009 from a meteorite dealer in Erfoud, Morocco.

Physical characteristics: Many small brownish individuals totalling 500 g.

Petrography: The silicate portion (about 60 vol%) of the meteorite dominantly consists of magmatically zoned up to 1.5 mm sized low-Ca pyroxene and less abundant olivine, Ca-pyroxene and calcic plagioclase. Minor phases include silica, chromite and merrillite. The metal portion has been completely altered to iron oxides and hydroxides.

Geochemistry: olivine: Fa41.4±0.3 (Fa41.1-42.0, n=11, FeO/MnO=45-50); low-Ca pyroxene: Fs26.6±6.5Wo3.3±1.1 (Fs15.7-41.1Wo0.7-5.0, n=41, FeO/MnO=27-38); Ca-pyroxene: Fs43.8±2.4Wo8.7±1.3 (Fs39.1-46.8Wo6.8-11.4, n=10, FeO/MnO=24-27); calcic plagioclase: An87.7±0.5 (An87.1-88.8, n=15)

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2009
Mass (g):500
Pieces:many
Class:Mesosiderite
Shock stage:low
Weathering grade:high
Fayalite (mol%):41.4
Ferrosilite (mol%):26.6; 43.8
Wollastonite (mol%):3.3; 8.7
Classifier:A. Greshake, MNB
Type spec mass (g):20.8
Type spec location:MNB
Main mass:Marcin Cimala
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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
bphd            
Piotr gural100   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7320 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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