Meteoritical Bulletin: Entry for Northwest Africa 6474

header

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 24 Apr 2024
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 6474

Basic information

Name: Northwest Africa 6474
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6474
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 312 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Brachinite
Recommended:			Brachinite [explanation]

This is 1 of 59 approved meteorites classified as Brachinite. [show all]
Search for other: Brachinites, Primitive achondrites

Comments:

Approved 31 Jan 2012

Writeup

help

Writeup from MB 100:

Northwest Africa 6474 (NWA 6474)

(Northwest Africa)

Purchased: Sept 2010

Classification: Primitive achondrite (Brachinite)

History: Purchased in 2010 September by Marc Jost from a dealer in Smara, Western Sahara.

Physical characteristics: A single dark brown stone weighing 312 g.

Petrography: Protogranular aggregate of olivine, clinopyroxene, zincian chromite, troilite, chlorapatite, minor intermediate plagioclase and taenite.

Geochemistry: Olivine Fa_35.7-36.1, Fe/Mn=71-76; clinopyroxene Fs_9.8-10.0Wo_45.4-46.0, Fe/Mn=33-35, Cr₂O₃=0.68-0.70 wt%. Oxygen isotopes (D. Rumble, CIW and R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave, respectively δ¹⁷O = 1.98, 1.943, 2.181; δ¹⁸O = 3.879, 3.829, 4.234; Δ¹⁷O = -0.064, -0.073, -0.048 per mil.

Classification: Achondrite (brachinite). This specimen has textural and mineralogical similarities to NWA 4882, but differs significantly in its oxygen isotopic composition.

Specimens: A total of 20.2 g and one polished thin section are on deposit at UWS. Mr. M. Jost holds the main mass.

Data from:
  MB100
  Table 1
  Line 1387:

Place of purchase:	Smara
Date:	P Sept 2010
Mass (g):	312
Pieces:	1
Class:	Brachinite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	35.7-36.1
Ferrosilite (mol%):	9.8-10.0
Wollastonite (mol%):	45.4-46.0
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.2
Type spec location:	UWS
Main mass:	M. Jost
Comments:	Submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)

Catalogs:

References:

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

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Dominik Stoeckli
Paulo Anselmo Matioli (JN Science Museum)

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Crosslinks:

This lists all records that are linked to this record and to each other.

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

Direct link to this page