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Northwest Africa 13286
Basic information Name: Northwest Africa 13286
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13286
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1050 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 379 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13286 (NWA 13286)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Howardite)

History: A 1050 g sample was found in Morocco. Thierry Simard purchased the sample at a market in Agadir, Morocco in October 2019.

Physical characteristics: Sample is light-brown in color and has an irregular shape. Approximately 30% of the sample is covered by a dark-brown, wind-ablated fusion crust. The cut face shows the interior is a breccia composed of a heterogeneous mixture of lithic clasts and fragmental mineral debris.

Petrography: Description and classification (A. Love, App): Sample is a polymict breccia composed of 0.5-2 cm rounded-angular, unequilibrated (pyroxenes show zonation) and equilibrated lithic and mineral clasts. Sample contains a heterogeneous mixture of dominant (77 vol %) equilibrated basaltic and cumulate lithologies, subordinate (23 vol%) heterogeneous diogenites, impact melt clasts and symplectites. Eucritic clasts and mineral fragments contain exsolved pyroxenes and some contain fayalitic veins. Additional minerals are olivine, ilmenite, chromite, Si-polymorphs, troilite, apatite, ferroan pigeonite.

Geochemistry: (A. Love, App): Diogenite clasts: low Ca pyroxene (Fs27.7±4.4Wo2.5±0.9(Fs22.3-32.8Wo1.2-3.8), Mg# 71.6±4.6, Fe/Mn=30.0±2.1, n=6); eucrites: low Ca pyroxene (Fs49.8±10.9Wo3.6±2.0 (Fs38.9-62.8Wo1.6-7.0), Fe/Mn=30.1±1.9, n=7); high Ca pyroxene exsolution lamellae (Fs36.8±10.1Wo33.7±9.5 (Fs27.9-49.8Wo22.1-42.8), Fe/Mn=30.3±2.8, n=6); plagioclase (An91.2±2.4 Or0.6±0.2), n=6.

Classification: HED achondrite (Howardite). Textures, mineral compositions and modal estimates of clastic debris (Fe/Mn ratios) indicate this sample is a howardite.

Specimens: Thierry Simard holds the main mass. A polished thin section and a 20.3 g type specimen are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2019
Mass (g):1050
Pieces:1
Class:Howardite
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):27.7±4.4; 49.8±10.9; 36.8±10.1
Wollastonite (mol%):2.5±0.9; 3.6±2.0; 33.7±9.5
Magnetic suscept.:3.43
Classifier:A. Love, App
Type spec mass (g):20.1
Type spec location:App
Main mass:Thierry Simard
Finder:Unknown
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: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7269 approved meteorites from (Northwest Africa) (plus 1987 unapproved names)

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