Meteoritical Bulletin: Entry for Northwest Africa 13986

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Northwest Africa 13986

Basic information

Name: Northwest Africa 13986
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13986
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 1845 g

Classification
history:

Recommended:

Winonaite [explanation]

This is 1 of 81 approved meteorites (plus 1 unapproved name) classified as Winonaite. [show all]
Search for other: Primitive achondrites, Winonaites

Comments:

Approved 21 Jun 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 13986 (NWA 13986)

(Northwest Africa)

Purchased: 2020 Dec

Classification: Primitive achondrite (Winonaite)

History: Purchased by Ziyao Wang in December 2020 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Triple grain junction texture (mean grainsize ~0.25 mm). Aggregate of forsterite, enstatite, diopside and plagioclase with accessory troilite, taenite, kamacite, daubreelite, alabandite and rare fluoroedenite.

Geochemistry: Forsterite (Fa_0.3-0.4, FeO/MnO = 5-6, N = 4), enstatite (Fs_0.2-0.6Wo_1.4-1.7, FeO/MnO = 5, N = 4), diopside (Fs_0.2-0.3Wo_46.3-46.8, FeO/MnO = 5, N = 3), plagioclase (An_30.3Or_1.5), fluoredenite (Na₂O = 4.1 wt.%, F = 4.3 wt.%).

Classification: Winonaite. This specimen is mineralogically different from winonaite NWA 13958 and many other recently classified winonaite specimens in being significantly more magnesian and also in containing minor F-bearing amphibole.

Specimens: 27 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2020 Dec
Mass (g):	1845
Pieces:	2
Class:	Winonaite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	0.3-0.4
Ferrosilite (mol%):	0.2-0.6; 0.2-0.3
Wollastonite (mol%):	1.4-1.7; 46.3-46.8
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	27
Type spec location:	UWB
Main mass:	WangZ
Comments:	Work name WZY-22; submitted by A. Irving

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, 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)

Catalogs:

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

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Fujun Ren
Ziyao Wang

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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