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Northwest Africa 15929
Basic information Name: Northwest Africa 15929
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15929
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 228 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  H5
Recommended:  H5    [explanation]

This is 1 of 11806 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 7 May 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15929 (NWA 15929)

(Northwest Africa)

Purchased: 11 Apr 2013

Classification: Ordinary chondrite (H5)

History: A 40 g end piece of the meteorite was sent to Cascadia by John Shea, who purchased the sample on ebay on April 11, 2013 from Star van Scriber (ebay username lenaheliodor1), who purchased the meteorite from a seller in Morocco in September 2009. 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 0749.

Physical characteristics: Physical Characteristics: Cascadia received a thick slice, which is medium brown in color, and crosscut by thin dark veins. Larger fractures are lined with a yellow-brown material, which is also found as isolated spots on the surface. Occasional areas show remnant metal and sulfide grains. Light and dark-colored chondrules can be discerned on the cut face.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): The sample chosen for thin sectioning was deliberately chosen to contain the least weathered material (most abundant metal) visible on the type specimen slice. The thin section is substantially dark in plane-polarized light due to extensive veins composed of iron oxide/hydroxides. A few chondrules can be discerned, but are badly dissected by veins. Metal and sulfide grains show scalloped edges and the few larger metal grains contain small inclusions of silicate. Backscattered electron (BSE) images show several readily discernable barred olivine chondrules and chondrule fragments with devitrified mesostases, all heavily veined. A rounded feldspathic-chromite assemblage resembling a chondrule and an apparent segment of a thick shock melt vein were observed. The latter has abundant blebs of iron oxide/hydroxide and entrained silicate fragments set in a silicate matrix.

Geochemistry: Olivine: Fa18.8±0.5, N=35; Low-Ca pyroxene: Fs16.7±0.4Wo1.3±0.3, N=25.

Classification: Ordinary chondrite (H5) based on mineral chemistry and texture.

Specimens: Cascadia holds 33.8 g in one piece, as well as a polished thin section.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:ebay
Date:P 11 Apr 2013
Mass (g):228
Pieces:1
Class:H5
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):18.8±0.5 (N=35)
Ferrosilite (mol%):16.7±0.4 (N=25)
Wollastonite (mol%):1.3±0.03 (N=25)
Classifier:M. Hutson, L. Young, and A. Ruzicka, Cascadia
Type spec mass (g):40
Type spec location:Cascadia
Main mass:MGoff (Martin Goff, MSG Meteorites, United Kingdom; http://www.msg-meteorites.co.uk/)
Comments:Lab number CML 0749; 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., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9806 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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