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| Northwest Africa 14262 | |||||||||||||||||||||||||||||||
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| 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:  232 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 7076 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 |
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: MB110 Table 0 Line 0: |
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| 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) |
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| 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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| Geography: |
Statistics: This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names) | ||||||||||||||||||||||||||||||