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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 119 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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