Meteoritical Bulletin: Entry for Northwest Africa 6485

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Northwest Africa 6485

Basic information

Name: Northwest Africa 6485
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6485
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 41.3 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	LL-melt rock
Recommended:			LL-melt rock [explanation]

This is 1 of 12 approved meteorites classified as LL-melt rock. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 1 Jul 2011

Writeup

help

Writeup from MB 100:

Northwest Africa 6485 (NWA 6485)

(Northwest Africa)

Purchased: June 2010

Classification: Ordinary chondrite (LL, melt rock)

History: Purchased in Sainte Marie, France, in 2010.

Physical characteristics: Dark-brown, 41.3 g, with relics of fusion crust. Cut surface is dark greenish-gray and shows achondritic texture. Medium weathering grade.

Petrography: (C. A. Lorenz; Vernad) Unbrecciated, medium-grained, achondritic, with poikilitic texture. Consists of pyroxene that poikilitically encloses olivine. Minor feldspar between orthopyroxene grains. Accessory phases - chromite, FeNi metal, and troilite.

Geochemistry: (N. N. Kononkova, Vernad, EMP) Olivine Fa_28.5(Fe/Mn = 53); pyroxene En_73.2Wo_3.7(Fe/Mn = 31.4); feldspar Ab_82.3An_12.1Or_5.6.Oxygen isotopic composition (Franchi I. A., OU, Laser fluorination): δ¹⁷O 3.87; δ¹⁸O 5.15; Δ¹⁷O 1.19 (per mil).

Specimens: 9.59 g sample and one polished section are on deposit at Vernad. The anonymous buyer holds the main mass.

Data from:
  MB100
  Table 1
  Line 1392:

Place of purchase:	Sainte Marie, France
Date:	P June 2010
Mass (g):	41.3
Pieces:	1
Class:	LL-melt rock
Weathering grade:	moderate
Fayalite (mol%):	28.5
Ferrosilite (mol%):	23.1
Wollastonite (mol%):	3.7
Classifier:	C. A. Lorenz, Vernad
Type spec mass (g):	9.59
Type spec location:	Vernad
Main mass:	anonymous
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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