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Northwest Africa 13981 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13981 This is an OFFICIAL meteorite name. Abbreviation: NWA 13981 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 4.04 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 15 approved meteorites classified as Eucrite-an. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 18 Jun 2021 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northwest Africa 13981 (NWA 13981) (Northwest Africa) Purchased: 2020 Jan Classification: HED achondrite (Eucrite, anomalous) History: Purchased by Ziyao Wang in January 2020 from a dealer in Laayoune, Morocco. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic igneous texture. Composed predominantly of prismatic grains of highly shocked exsolved pigeonite and lath-like grains of shocked plagioclase with accessory silica polymorph, ilmenite, troilite, low-Ti chromite and rare zircon. Pyroxene is shock-darkened (orange to brown in thin section) and in part polygranular; some plagioclase has been transformed to isotropic maskelynite, but some is birefringent yet exhibits highly undulose extinction. Some veinlets and pockets of shock glass (deep sepia brown to black in thin section with "swirly" texture) are also present. Geochemistry: Low-Ca pyroxene host (Fs65.0-67.9Wo1.6-1.9, FeO/MnO = 34-36, N = 4), augite exsolution lamellae (Fs28.6-29.5Wo43.4-44.4, FeO/MnO = 33-37, N = 4), plagioclase (An74.8-77.5Or0.7-1.2, N = 3). Classification: Eucrite (unbrecciated, anomalous, shocked, maskelynite-bearing). The pyroxenes in this specimen are much more ferroan than in typical eucrites, and have compositions akin to those in anomalous eucrites NWA 11729 and NWA 12445; the plagioclase is also more sodic than in typical eucrites. Specimens: 30.8 g including one polished thin section at UWB; remainder held jointly by Ziyao Wang and Fangmei Wang. | ||||||||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
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Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021) |
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Catalogs: |
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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 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
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