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Northwest Africa 15178 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15178 This is an OFFICIAL meteorite name. Abbreviation: NWA 15178 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 11238 approved meteorites (plus 22 unapproved names) classified as H5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 6 Aug 2022 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 111:
Northwest Africa 15178 (NWA 15178) (Northwest Africa) Purchased: 31 Mar 2013 Classification: Ordinary chondrite (H5) History: A 42.3 g piece of the meteorite was sent to Cascadia by John Shea. Shea purchased a whole stone on March 31, 2013, via e-mail from Mike Bandli Historic Meteorites, who purchased the stone from Caillou Noir in 2003. The sample came with a label from Caillour Noir which listed this as "Unclassified Meteorite #3142" with location as "Sahara" and find date "2002/2003". On January 19, 2021, Martin Goff emailed Cascadia that he hadd "recently acquired a box of NWA Chondrites that came from US collector john/Johannes Shea", including CML 0752. Physical characteristics: Physical Characteristics: Images sent by John Shea show a fully fusion crusted individual with regmaglypts on one surface and shrinkage cracks on another surface. The fusion crust is black with small brown patches. A small chip along an edge shows a light-colored interior with a protruding metal grain. The cut face on the type specimen is a patchwork of light to medium gray areas with small amounts of yellow/brown discoloration and abundant metal. Petrography: (M. Hutson, A. Ruzicka, Cascadia): Numerous chondrules can be discerned in thin section, but most lack sharp boundaries with surrounding material. Most feldspathic material is forming feldspathic-chromite assemblages; the single crystalline grains of plagioclase feldspar measured are < 50 µm across, with one exception. Abundant merrillite grains (up to 500 μm across) were observed. Geochemistry: Olivine: Fa17.5±0.6, N=31; low-Ca pyroxene: Fs15.7±0.8Wo1.2±0.4, N=26. Classification: Ordinary chondrite (H5) based on texture and chemistry. Specimens: Cascadia holds 39.9 g in two pieces, as well as a polished thin section; MGoff holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB111 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) Caillou Noir: Caillou Noir 100 Chemin des Campenes, 74400 Chamonix, France; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography: |
Statistics: This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |