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| Northwest Africa 13996 | |||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13996 This is an OFFICIAL meteorite name. Abbreviation: NWA 13996 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass:  163 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 23 approved meteorites classified as EL-melt rock. [show all] Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites | ||||||||||||||||||||||||||||
| Comments: | Approved 17 Jul 2021 | ||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13996 (NWA 13996) (Northwest Africa) Purchased: 2018 Classification: Enstatite chondrite (EL melt rock) History: Purchased in 2018 by Geologist Juan Aviles Poblador from a meteorite dealer in Morocco. Physical characteristics: Single weathered stone with minor fusion crust. Impact melt pockets and vesicles are present in varying abundance between different fragments and slices of the sample. Petrography: (D. Sheikh, Cascadia) This sample exhibits an equigranular texture consisting primarily of recrystallized grains of enstatite (~94 vol.% ,Av. 75±10 µm, n=20), and accessory albitic plagioclase, oldhamite, daubreelite, troilite, silica glass, and sparse grains of kamacite (< 1 vol. %, containing ~1.5 wt.% Si, n=3). A few relict chondrules were observed, most displaying a radial pyroxene texture (Av. 1 mm, up to 3 mm, n=4). Geochemistry: Enstatite (Fs0.1±0.1Wo1.4±0.1, range Fs0.0-0.6Wo1.1-1.6, n=70), Plagioclase (An16.2±0.6 Or3.8±0.4, range An15.5-16.9 Or3.1-4.2, n=8). Classification: Enstatite-melt rock (EL-melt rock). EL due to the amount of Si in kamacite, melt rock due to the overall texture. Specimens: 21.1 g and a thin section at Cascadia; main mass with Juan Aviles Poblador. | ||||||||||||||||||||||||||||
| 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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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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| Geography: |
Statistics: This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names) | ||||||||||||||||||||||||||||