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Northwest Africa 13863
Basic information Name: Northwest Africa 13863
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13863
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 280 g
Recommended:  Achondrite-ung    [explanation]

This is 1 of 138 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 20 Dec 2021
Writeup from MB 110:

Northwest Africa 13863 (NWA 13863)

(Northwest Africa)

Purchased: 2020 Feb

Classification: Ungrouped achondrite

History: Purchased by Dengqin Xu from a Moroccan dealer and sold to Ziyao Wang in February 2020.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Igneous cumulate texture. Composed mainly of zoned olivine together with intercumulus pigeonite, subcalcic augite and sodic plagioclase-like glass plus accessory troilite, low-Ti chromite and minor kamacite.

Geochemistry: Olivine (cores Fa15.5-17.2, rims Fa20.1-24.8, FeO/MnO = 45-51, N = 8), pigeonite (Fs25.1-29.0Wo6.4-13.8, FeO/MnO = 24-27, N = 4), subcalcic augite (Fs23.8-39.8Wo21.2-28.4, FeO/MnO = 23-31, N = 4), feldspathic glass (approximate composition An63.3Ab21.9Or14.8).

Classification: Achondrite (igneous, ultramafic, ungrouped). This specimen is evidently paired with NWA 13446 based on identical textures and mineralogy.

Specimens: 25.1 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:China
Date:P 2020 Feb
Mass (g):280
Shock stage:low
Weathering grade:low
Fayalite (mol%):15.5-24.8
Ferrosilite (mol%):25.1-29.0; 23.8-39.8
Wollastonite (mol%):6.4-13.8; 21.2-28.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.1
Type spec location:UWB
Main mass:Z. Wang
Comments:Work name WZY-13; submitted by A. Irving
   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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
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 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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