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Northwest Africa 13686
Basic information Name: Northwest Africa 13686
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13686
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 341 g
Classification
  history:
Recommended:  R5    [explanation]

This is 1 of 39 approved meteorites classified as R5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 28 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13686 (NWA 13686)

Mauritania

Purchased: 2020

Classification: Rumuruti chondrite (R5)

History: Carlos Muñecas purchased the 341 g sample from a dealer in Mauritania.

Physical characteristics: Sample is partially coated with a dark contraction-cracked fusion crust. The cut face shows the interior is a breccia composed of light grey irregular-shaped recrystallized clasts and dark-gray host with visible chondrules and fine-grained dispersed sulfides.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of recrystallized chondritic clasts surrounded by a brecciated host of similar materials. Sulfides within recrystallized clasts are coarsely crystalline, while sulfides within host are finely disseminated. Average apparent diameter of chondrules is 411 µm, n=58. Plagioclase occurs in distinct isolated intergrowths. Additional minerals are: Ti-bearing chromite, abundant pentlandite, FeS and apatite.

Geochemistry: Olivine (Fa39.1±0.3, Fe/Mn=70.5±2.8, n=20); low Ca pyroxene (Fs31.1±0.3Wo1.7±0.7, Fe/Mn=47.4±1.9, n=9); high Ca pyroxene (Fs12.4±0.5Wo43.0±1.1, Fe/Mn=42.9±3.5, n=10).

Classification: Rumuruti chondrite (R5 breccia, C-S3, wi-0) Based on ubiquitous sulfides and equilibrated compositions of olivine and pyroxene, sample is an R5 breccia.

Specimens: Carlos Muñecas holds the main mass. Two slices weighing 20.08 g and a polished thin section are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
Date:P 2020
Mass (g):341
Pieces:1
Class:R5
Shock stage:C-S3
Weathering grade:wi-0
Fayalite (mol%):39.1±0.3
Ferrosilite (mol%):31.1±0.3; 12.4±0.5
Wollastonite (mol%):1.7±0.7; 43.0±1.1
Magnetic suscept.:3.63
Classifier:A. Love, App
Type spec mass (g):20.08
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
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 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
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Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love         
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 195 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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