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Northwest Africa 13683
Basic information Name: Northwest Africa 13683
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13683
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 1959 g
Recommended:  R3-6    [explanation]

This is 1 of 30 approved meteorites classified as R3-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 13 Feb 2021
Writeup from MB 110:

Northwest Africa 13683 (NWA 13683)

Adrar, Algeria

Find: 2018

Classification: Rumuruti chondrite (R3-6)

History: Found between 2018-2019. Many meteorites weighing a total of 1959 grams were purchased by Adria_n Contreras Gómez from a Sahara seller in July 2020.

Physical characteristics: Sample lacks fusion crust, is irregular-shaped and shows abundant chondrules surrounded by sulfides.

Petrography: Description and classification (A. Love, App) Sample is a genomict chondrite breccia composed of rounded to angular clasts of unequilibrated and recrystallized textures occurring within a host of slightly flattened, dispersed chondrules, fragments and sulfide grains. Recrystallized clasts lack discernible chondrules and low Ca pyroxene, and contains a network of 50µm secondary plagioclase. Chondrules average apparent diameter 424µm (n=105). Additional minerals are: troilite, abundant pentlandite, phosphate and chromite.

Geochemistry: Host: olivine (Fa32.2±14.3, CV%=43 (R3.5), Fe/Mn=80.7±23.0, n=30); low Ca pyroxene (Fs6.6±6.0Wo1.0±0.8, Fe/Mn=19.7±11.6, n=7); pigeonite (Fs21.4±2.9Wo9.5±2.7, n=3); unequilibrated clast: olivine (Fa20.1±14.4, CV%=72 (R3.2), Fe/Mn=62.6±30.6, n=12); recrystallized clast: olivine (Fa37.6±0.1, Fe/Mn=73.1±3.6, n=6); high Ca pyroxene (Fs13.4±0.1Wo39.1±0.4, Fe/Mn=36.8±2.2, n=3).

Classification: Rumuruti chondrite (R3-6, C-S2, wi-2) Chondrule diameter, magnetic susceptibility, ubiquitous pentlandite and lack of FeNi metal suggest sample is an R chondrite. Based on unequilibrated compositions and coefficient of variation w/in clast and host, sample is an R3.2-6.

Specimens: Adrián Contreras holds the 290 g main mass. An endcut and several small fragments weighing 28.06 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Mass (g):1959
Shock stage:low
Weathering grade:wi-2
Fayalite (mol%):32.2±14.3; 20.1±14.4; 37.6±0.1
Ferrosilite (mol%):6.6±6.0; 21.4±2.9; 13.4±0.1
Wollastonite (mol%):1.0±0.8; 9.5±2.7; 39.1±0.4
Magnetic suscept.:3.16
Classifier:A. Love, App
Type spec mass (g):28.06
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. 110, in preparation (2021)
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     This is 1 of 177 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1208 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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