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Northwest Africa 13439
Basic information Name: Northwest Africa 13439
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13439
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 660 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 513 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13439 (NWA 13439)

Morocco

Purchased: 2018

Classification: HED achondrite (Eucrite)

History: Thierry Simard purchased the 660 g sample in Zagora, Morocco, in November 2018.

Physical characteristics: Approximately 40% of the sample is covered in a dark brown, wind-ablated fusion crust. The remainder of the stone is light grey in color and crystalline. The cut face shows the interior of the sample is light grey and has a basaltic texture.

Petrography: (A. Love, App) Sample is unbrecciated, ophitic textured and transected by thin shock veins and planar dislocations. Some pyroxene grains have been recrystallized into finer-grained mosaics and both pyroxenes and plagioclase show clouding from fine-grained opaques. Pyroxenes are exsolved and inverted. Additional minerals are: Si polymorph, troilite, ilmenite, chromite, rare apatite. clouding from fine-grained opaques. Pyroxenes are exsolved and inverted. Additional minerals are: Silica polymorph, troilite, ilmenite, chromite, rare apatite.

Geochemistry: (A. Love, App) Low Ca pyroxene (Fs62.7±0.3Wo1.9±0.1, Fe/Mn=30.1±0.2, Mg#36.0±0.3, n=8); high Ca pyroxene (Fs27.2±0.5Wo44.1±0.4, Fe/Mn=30.0±0.4, n=8); plagioclase (An87.9±2.7Or0.5±0.3, n=6).

Classification: HED achondrite (Eucrite) Based on textures, equilibrated compositions, Mg# and Fe/Mn ratios of pyroxenes, this sample is an equilibrated basaltic eucrite.

Specimens: T. Simard holds the main mass. Several slices, a polished thin section and mount comprise the 20.02g type specimen that is on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora, Morocco
Date:P 2018
Mass (g):660
Pieces:1
Class:Eucrite
Weathering grade:low
Ferrosilite (mol%):62.7±0.3; 27.2±0.5
Wollastonite (mol%):1.9±0.1;44.1±0.4
Classifier:A. Love, App
Type spec mass (g):20.02
Type spec location:App
Main mass:Thierry Simard
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1670 approved meteorites from Morocco (plus 23 unapproved names) (plus 1 impact crater)

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