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Northwest Africa 15179
Basic information Name: Northwest Africa 15179
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15179
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 120 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  H5
Recommended:  H5    [explanation]

This is 1 of 11801 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
Writeuphelp
Writeup from MB 111:

Northwest Africa 15179 (NWA 15179)

(Northwest Africa)

Purchased: 11 Apr 2013

Classification: Ordinary chondrite (H5)

History: A 44.3 g piece of the meteorite was sent to Cascadia by John Shea, who purchased the sample on April 11, 2013 from Star Van Scriver, who in turn purchased the sample in Morocco in September 2009 from "kids that go to the desert to look for them". On January 19, 2021, Martin Goff emailed Cascadia that he had "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 single stone entirely covered by a weathered fusion crust and crosscut by large fractures filled with light brown material. The cut face of the type specimen is medium brown and extensively crosscut by darker brown veins; a few lighter colored chondrules are visible.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): In thin section, the meteorite is extensively crosscut by weathering veins. Despite this, the sample appears to be relatively integrated, with a small number of discernable chondrules. BSE imaging shows that most of meteorite contains equilibrated silicates, but that there is a small (~5 area %) admixture of unequilibrated (type 3) material (both magnesian and iron-rich olivine and magnesian pyroxene grains) sprinkled randomly throughout the equilibrated material. The equilibrated material contains crystalline plagioclase feldspar grains that are typically ~20 µm across, although one 60 µm long grain was observed.

Geochemistry: Equilibrated lithology: Fa19.0±0.8, N=27; pyroxene: Fs16.2±0.8Wo1.3±0.3, N=17; plagioclase feldspar: Ab81.2±0.4Or6.3±0.6An12.5±0.8, N=5. Four areas were chosen using BSE imaging in order to sample the unequilibrated material (anomalous grains). Olivine was variable, with Fa ranging from 2.5-24.9 (N=7), while associated pyroxene grains were magnesian (Fs4.5±1.0Wo0.7±0.9, N=8).

Classification: Ordinary Chondrite (H5) base on chemistry, texture, and feldspar grain size.

Specimens: Cascadia holds 39.4 g in two pieces, as well as a polished thin section; MGoff holds the main mass.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Ebay
Date:P 11 Apr 2013
Mass (g):120
Pieces:1
Class:H5
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):19.0±0.8, N=27
Ferrosilite (mol%):16.2±0.8, N=17
Wollastonite (mol%):1.3±0.3, N=17
Classifier:M. Hutson, M. Jennings, and A. Ruzicka, Cascadia
Type spec mass (g):39.4
Type spec location:Cascadia
Main mass:MGoff (Martin Goff, MSG Meteorites, United Kingdom; http://www.msg-meteorites.co.uk/)
Comments:Lab number CML 0752; submitted by Melinda Hutson
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)
Catalogs:
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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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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