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Northwest Africa 14262
Basic information Name: Northwest Africa 14262
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14262
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 232 g
Meteoritical Bulletin:  MB 110  (2022)  H6
Recommended:  H6    [explanation]

This is 1 of 6895 approved meteorites (plus 6 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 6 Oct 2021
Writeup from MB 110:

Northwest Africa 14262 (NWA 14262)

(Northwest Africa)

Purchased: Sept. 2009

Classification: Ordinary chondrite (H6)

History: Sent to Cascadia by John Shea (ebay username bigjohnshea). Shea purchased on April 11, 2013 from Star Van Scriver (ebay username lenaheliodor1) and was given the information that Scriver 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’d "recently acquired a box of NWA Chondrites that came from US collector john/Johannes Shea", including CML 0748.

Physical characteristics: Physical Characteristics: Sample is covered by a dark reddish-brown desert varnish and crosscut by numerous fractures. Cut face shows a ≤1 cm thick reddish-brown weathered zone surrounding a brown-gray core of less weathered material which has readily distinguished chondrules. Fractures through this core are surrounded by thin (≤1 mm) reddish-brown weathered zones.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): Two large (~ 0.25 mm thick) veins comprised of iron-rich weathering products cut across the thin section. A ubiquitous network of smaller veins outlines chondrules. Most of the plagioclase feldspar grains examined were ≤50 microns across, although there were localized concentrations of coarser (≤100 microns) grains, which showed undulose extinction in cross-polarized light. Both in plane-polarized light and backscattered electron (BSE) images, interchondrule material appears similar in size to chondrule grains; chondrule mesostases are crystalline, but somewhat finer-grained than interchondrule material. The textures suggest that the meteorite experienced thermal metamorphism close to the border of petrographic types 5 and 6.

Geochemistry: Olivine: Fa18.3±0.4, N=30; Low-Ca pyroxene: Fs16.2±0.1Wo1.2±0.2, N=28, plagioclase feldspar: Ab83.2±1.2Or5.7±0.7, N=6.

Classification: Ordinary chondrite (H6) based on mineral chemistry, texture, and plagioclase feldspar grain size.

Specimens: Cascadia holds 55.9 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:Morocco
Date:P Sept. 2009
Mass (g):232
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):18.3±0.4 (N=30)
Ferrosilite (mol%):16.2±0.1 (N=28)
Wollastonite (mol%):1.2±0.2 (N=28)
Classifier:M. Hutson, A. Ruzicka and M. Jennings, Cascadia
Type spec mass (g):55.9
Type spec location:Cascadia
Main mass:MGoff (Martin Goff, MSG Meteorites, United Kingdom; http://www.msg-meteorites.co.uk/)
Comments:Lab number CML 0748; 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)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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