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| Northwest Africa 6579 | |||||||||||||||||||||||||||
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| 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:  95 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 55 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 |
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: MB99 Table 0 Line 0: |
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| 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) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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| Geography: |
Statistics: This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names) | ||||||||||||||||||||||||||