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Northwest Africa 6579
Basic information Name: Northwest Africa 6579
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6579
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 95 g
Meteoritical Bulletin:  MB 99  (2011)  L-melt rock
Recommended:  L-melt rock    [explanation]

This is 1 of 52 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Mar 2011
Writeup from MB 99:

Northwest Africa 6579 (NWA 6579)

(Northwest Africa)

Purchased: July, 2005

Classification: Ordinary chondrite (L, melt rock)

History: A portion of the sample was donated to Cascadia on August 15, 2005.

Physical characteristics: The rock lacks fusion crust and has a reddish-brown weathered exterior that contains metallic protrusions and parallel elongate vesicles up to 5 mm long.

Petrography: (A.Ruzicka and K. Hauver, Cascadia) The sample consists primarily of fine-grained (~25 μm across) euhedral-subhedral olivine set in glass; cellular- and dendritic-textured metal-sulfide nodules partly line vesicles.

Geochemistry: olivine Fa 22.4±0.8 (n=24); martensite Ni 12.0±3.0 wt% and Co 0.58±0.03 wt% (n=30).

Classification: Ordinary chondrite (L) melt rock. Olivine composition is in the range for L chondrites and martensite composition is similar to the bulk composition of metal in L chondrites. Silicate and metal-sulfide textures suggest rapid cooling from a melt.

Specimens: Type specimens available at Cascadia include 4 pieces originally totaling 21.1 g, with one polished thin section and one polished butt made from one piece. Reed holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P July, 2005
Mass (g):95
Class:L-melt rock
Shock stage:high
Weathering grade:W2
Fayalite (mol%):22.4
Classifier:A. Ruzicka, K. Hauver
Type spec mass (g):21.1
Type spec location:Cascadia
Main mass:Reed
Comments:Field number CML0358.; submitted by A. Ruzicka
   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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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