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 71 approved meteorites 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 Meteoritical Bulletin, no. 110, in preparation (2021)

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)
Ziyao Wang

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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