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Northwest Africa 13566
Basic information Name: Northwest Africa 13566
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13566
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 826 g
Recommended:  LL4    [explanation]

This is 1 of 387 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Dec 2020
Writeup from MB 109:

Northwest Africa 13566 (NWA 13566)


Purchased: 2020

Classification: Ordinary chondrite (LL4)

History: The sample was purchased by Carlos Muñecas (Expometeoritos) in 12 July 2020 from a dealer in Ouarzazate, Morocco.

Physical characteristics: Sample has a triangular prism shape and has a dark brown, wind-ablated exterior. The cut face of the interior is dark gray and shows dispersed metal grains in a chondritic textured host.

Petrography: Description and classification (A. Love, App) Chondrules (with an average apparent diameter of 640 µm, n=59) set within a nearly opaque, recrystallized matrix containing abundant FeS veinlets. Plagioclase occurs as isolated intergrowths. Additional minerals: apatite, chromite, troilite, pentlandite, rare (<1%) FeNi metal.

Geochemistry: (A. Love, App) Olivine (Fa35.3±0.7, Fe/Mn=66.5±0.9, n=10); low-Ca Pyroxene (Fs28.0±3.6Wo1.2±0.5 (Fs17.2-30.2Wo0.5-2.4), Fe/Mn=44.6±3.8, n=11); pigeonite(Fs23.9Wo13.5, Fe/Mn=28.7, n=1); high-Ca pyroxene (Fs13.5Wo31.5, Fe/Mn=37.7, n=1).

Classification: Ordinary chondrite (Shock darkened LL4, C-S3, W1). Fa and Fs are outside the normal range for LL chondrites. Fe/Mn of olivine and pyroxene and average chondrule diameter fall just outside the range of LL ordinary chondrites. Magnetic susceptibility falls within the range for LL chondrites.

Specimens: Carlos Muñecas (Expometeoritos) holds the main mass. A slice weighing 20. 1g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouarzazate, Morocco
Date:P 2020
Mass (g):825.5
Shock stage:C-S3
Weathering grade:W1
Fayalite (mol%):35.3±0.7
Ferrosilite (mol%):28.0±3.6; 14.0
Wollastonite (mol%):1.2±0.5; 31.5
Magnetic suscept.:4.32
Classifier:A. Love, App
Type spec mass (g):20.1
Type spec location:App
Main mass:Carlos Muñecas(Expometeoritos)
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 1904 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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