header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 24 Jul 2021
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 13981
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:help 4.04 kg
Classification
  history:
Recommended:  Eucrite-an    [explanation]

This is 1 of 12 approved meteorites classified as Eucrite-an.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Jun 2021
Writeuphelp
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:
Place of purchase:Laayoune
Date:P 2020 Jan
Mass (g):4038
Pieces:1
Class:Eucrite-an
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):65.0-67.9;28.6-29.3
Wollastonite (mol%):1.6-1.9; 43.4-44.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):30.8
Type spec location:UWB
Main mass:WangZ/F. Wang
Comments:Work name WZY-18; 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:
CreditPhotos
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 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

Direct link to this page