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Northwest Africa 13533 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13533 This is an OFFICIAL meteorite name. Abbreviation: NWA 13533 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 12331 approved meteorites (plus 8 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Nov 2020 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 13533 (NWA 13533) (Northwest Africa) Purchased: 2018 Mar 06 Classification: Ordinary chondrite (L6) History: Purchased in Portland, Oregon from Patrick Thompson as an unclassified meteorite from northwest Africa that was obtained in Tucson, Arizona. Physical characteristics: Single flattened individual that is covered in fusion crust except for broken face that has a weathering patina. A cut face reveals metal grains and chondritic texture with spatially variable weathering stains (more developed towards one face). Two shock veins are subparallel to the two main flat faces of the individual. Petrography: (K. Maccini, A. Ruzicka, Cascadia): In thin section, chondritic texture with indistinct chondrules are visible. Chief phases include olivine and low-Ca pyroxene, opaques (chiefly metal with lesser troilite) comprising up to ~7 area%, and maskelynite. One end of the section is notably stained; the rest of the sample has limited patches of weather staining centered on metal. In the prevailing low-stained portion of the sample, weathering products compose <5 area%. Shock stages based on olivine correspond to a conventional shock stage of S4 and a weighted shock stage (Jamsja and Ruzicka, 2010) of 3.7±0.6 (N=40). Geochemistry: Mineral compositions and geochemistry: Olivine and low-Ca pyroxene grains are highly equilibrated: Fa24.3±1.0 N=70; Fs21.2±0.9Wo1.3±0.4, N=29. Classification: Ordinary chondrite (L6) based on olivine fayalite and pyroxene ferrosilite content and overall texture. Specimens: Cascadia holds 457.2 g in three pieces, including the main mass, a slice, an end cut, as well as a polished thin section and butt. | ||||||||||||||||||||||||||||||
Data from: MB109 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) Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |