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Northwest Africa 13996
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:help 163 g
Meteoritical Bulletin:  MB 110  (2022)  EL-melt rock
Recommended:  EL-melt rock    [explanation]

This is 1 of 26 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 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:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):163
Class:EL-melt rock
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):0.1±0.1
Wollastonite (mol%):1.4±0.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):21.1
Type spec location:Cascadia
Main mass:Juan Aviles Poblador
Comments:Submitted by Daniel Sheikh
   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 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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