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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:help 1100 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  R3-5
Recommended:  R3-5    [explanation]

This is 1 of 24 approved meteorites classified as R3-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 29 Dec 2010
Writeuphelp
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 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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