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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
Meteoritical Bulletin:  MB 111  (2023)  H5
Recommended:  H5    [explanation]

This is 1 of 11567 approved meteorites (plus 23 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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