Meteoritical Bulletin: Entry for Northwest Africa 6491

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 29 May 2023
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 6491

Basic information

Name: Northwest Africa 6491
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6491
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 1100 g

Classification
history:

Meteoritical Bulletin:	MB 99	(2011)	R3-5
Recommended:			R3-5 [explanation]

This is 1 of 23 approved meteorites classified as R3-5. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)

Comments:

Approved 29 Dec 2010

Writeup

Writeup from MB 99:

Northwest Africa 6491 (NWA 6491)

(Northwest Africa)

Purchased: Summer 2004

Classification: Rumuruti chondrite (R3-5)

History: Two pieces of the meteorite were donated to Cascadia on February 24, 2006.

Physical characteristics: Exterior has a brownish, waxy fusion crust that appears weakly weathered. The interior is brownish-red, with black to light-brown chondritic-textured clasts.

Classification: Rumuruti chondrite (R3-5)

Specimens: Type specimens available at Cascadia include 3 pieces that add to 20.6 g, 3 polished thin sections, and one mounted butt. Thompson holds the main mass, which now weighs 785 g.

Data from:
  MB99
  Table 0
  Line 0:

Place of purchase:	Midelt, Morocco
Date:	P Summer 2004
Mass (g):	1100
Pieces:	11
Class:	R3-5
Shock stage:	S2-4
Weathering grade:	low
Fayalite (mol%):	34.5±11.3
Ferrosilite (mol%):	17.4±14.2, 16.1±9.2
Wollastonite (mol%):	1.7±1.6, 43.3±4.2
Classifier:	Niina Jamsja and Alex Ruzicka, Cascadia
Type spec mass (g):	20.6
Type spec location:	Cascadia
Main mass:	Thompson
Comments:	Submitted by Alex Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (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:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

Direct link to this page