Meteoritical Bulletin: Entry for Northwest Africa 6356

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Northwest Africa 6356

Basic information

Name: Northwest Africa 6356
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6356
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 554 g

Classification
history:

Meteoritical Bulletin:	MB 99	(2011)	Ureilite-pmict
Recommended:			Ureilite-pmict [explanation]

This is 1 of 32 approved meteorites classified as Ureilite-pmict. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 4 Jan 2011

Writeup

help

Writeup from MB 99:

Northwest Africa 6356 (NWA 6356)

(Northwest Africa)

Purchased: 2005

Classification: Ureilite (polymict)

History: The stone was purchased by H. Stehlik in Munich from an anonymous dealer.

Physical characteristics: One piece of 554 g is grayish-brown in color. Fusion crust is absent.

Petrography: (C. Lorenz, Vernad). Polymict breccia dominated by fragments of a coarse-grained olivine rock, embedded in fine-grained clastic matrix. Melt rocks, chondrule fragments and carbonaceous chondrite clasts are present. The accessory minerals are pyroxene, feldspar, metal, troilite and chromite. Carbon occurs as graphite and rarely as a dense modification, probably diamond.

Geochemistry: (N. Kononkova, EMP, Vernad) Olivine (Fo_78.1; Fe/Mn=41.6; 0.61 wt% Cr₂O₃; 0.32 wt% CaO) is zoned on the contacts with carbon up to Fo₉₅(Fe/Mn=10); pyroxene (En_76.8Wo_4.2, Fe/Mn=28.9; 1.1-1.5 wt% Cr₂O₃), feldspar (Ab_85.8-89.5An_3.9-10.7). Oxygen isotopic compositions: (I. Franchi, OU) δ¹⁸O = 7.84; δ¹⁷O = 3.32; Δ¹⁷O = -0.764.

Classification: Ureilite (polymict), degree of weathering is moderate.

Specimens: A total sample mass of 23 g and one thin section are on deposit at Vernad. H. Stehlik holds the main mass.

Data from:
  MB99
  Table 0
  Line 0:

Place of purchase:	Munich, Germany
Date:	P 2005
Mass (g):	554
Pieces:	1
Class:	Ureilite-pmict
Weathering grade:	moderate
Fayalite (mol%):	12
Ferrosilite (mol%):	14
Wollastonite (mol%):	4.2
Classifier:	C. A. Lorenz, Vernad.
Type spec mass (g):	23
Type spec location:	Vernad.
Main mass:	H. Stehlik
Comments:	Submitted by C. A. Lorenz

Plots:

O isotopes:

Institutions
and collections

OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Stehlik: Harald Stehlik, 1220 Wien, Austria (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9128 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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