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Northwest Africa 15178
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:help 348 g
Recommended:  H5    [explanation]

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 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:
  Table 0
  Line 0:
Place of purchase:internet
Date:P 31 Mar 2013
Mass (g):348
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):17.5±0.6, N=31
Ferrosilite (mol%):15.7±0.8, N=26
Wollastonite (mol%):1.2±0.4, N=26
Classifier:M. Hutson, M. Jennings, and A. Ruzicka, Cascadia
Type spec mass (g):39.9
Type spec location:Cascadia
Main mass:MGoff (Martin Goff, MSG Meteorites, United Kingdom; http://www.msg-meteorites.co.uk/)
Comments:Lab number CML 0745; submitted by Melinda Hutson
   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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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