header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 24 Apr 2024
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 13985
Basic information Name: Northwest Africa 13985
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13985
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 312 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 409 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 29 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13985 (NWA 13985)

(Northwest Africa)

Purchased: 2020 Feb

Classification: HED achondrite (Eucrite, polymict)

History: Purchased in Mali in February 2020 by a Saharawi consortium represented by David Lehman.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Angular mineral clasts of exsolved pigeonite, calcic plagioclase, pigeonite, subcalcic augite and compositionally-zoned diogenitic orthopyroxene, plus some lithic clasts, are set in a fine grained matrix containing accessory silica polymoprh, ilmenite and stained kamacite. Lithic clasts comprise eucrites with various textures (microgabbroic, fine-grained ophitic, quench-textured) and rare diogenite (containing orthopyroxene exhibiting undulose extinction). The proportion of diogenitic material is estimated to be <5 vol.%.

Geochemistry: Pigeonite host (Fs57.9Wo13.1, FeO/MnO = 31), augite exsolution lamella (Fs21.4Wo40.3, FeO/MnO = 25), pigeonite (Fs42.1Wo 6.9, FeO/MnO = 26), subcalcic augite (Fs39.8Wo33.8, FeO/MnO = 32), diogenitic orthopyroxene (cores Fs22.3-23.2Wo1.4-2.2, FeO/MnO = 30-33, N = 2; rims Fs51.4-51.5Wo1.1-1.2, FeO/MnO = 31-33, N = 2), plagioclase (An84.8-94.9Or0.6-0.2, N = 3).

Classification: Eucrite (polymict breccia).

Specimens: 25 g including one polished thin section at UWB; remainder with Mr. D. Lehman.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2020 Feb
Mass (g):312
Pieces:1
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):22.3-23.2; 51.4-51.5; 39.8; 21.4
Wollastonite (mol%):1.4-2.2; 1.1-1.2; 33.8; 40.3
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.0
Type spec location:UWB
Main mass:D. Lehman
Comments:Work name DL 1054; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
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:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)
Also see:
  This lists the most popular meteorites among people who looked up this meteorite.
Revision
  history:
  This lists important revisions made to data for this record.

Direct link to this page