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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 38 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Anthony Love         
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 175 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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