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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
Classification
  history:
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
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
State/Prov/County:Adrar
Date:2018
Mass (g):1959
Pieces:many
Class:R3-6
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
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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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 180 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1236 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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