Meteoritical Bulletin: Entry for Northwest Africa 6256

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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: 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

Writeup

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: Fa_41.4±0.3(Fa_41.1-42.0, n=11, FeO/MnO=45-50); low-Ca pyroxene: Fs_26.6±6.5Wo_3.3±1.1(Fs_15.7-41.1Wo_0.7-5.0, n=41, FeO/MnO=27-38); Ca-pyroxene: Fs_43.8±2.4Wo_8.7±1.3(Fs_39.1-46.8Wo_6.8-11.4, n=10, FeO/MnO=24-27); calcic plagioclase: An_87.7±0.5(An_87.1-88.8, 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:

Credit	Photos
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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