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Northwest Africa 15685
Basic information Name: Northwest Africa 15685
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15685
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1122 g
Meteoritical Bulletin:  MB 112  (2023)  CK6
Recommended:  CK6    [explanation]

This is 1 of 83 approved meteorites classified as CK6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 23 Feb 2023
Writeup from MB 112:

Northwest Africa 15685 (NWA 15685)

(Northwest Africa)

Purchased: 2022

Classification: Carbonaceous chondrite (CK6)

History: Many samples (<1 to 289 g) were found in northwest Africa. Adrián Contreras Gómez (CRATER meteorites) purchased the meteorites from Salamo Zigam in Tindouf, Algeria in 2022.

Physical characteristics: Sample is a dark-colored, irregularly shaped, partially crusted stone. The cut face shows the interior is dark green in color and shows dispersed dark-colored chondrules.

Petrography: Description and classification (A. Love, App) Sample shows a recrystallized chondritic with large dispersed chondrules (avg. apparent diameter 776 µm, n=18) in a recrystallized matrix composed of olivine, high Ca pyroxene, plagioclase (avg grain size 76 µm, n=11) and Cr-bearing magnetite. Additional minerals are: chromite apatite and rare troilite.

Geochemistry: (A. Love, App) Olivine (Fa31.8±0.2, Fe/Mn=103.7±4.7, n=10); low Ca-pyroxene (Fs27.0±0.3Wo0.9±0.1, Fe/Mn=68.9±2.7 n=6); high Ca pyroxene (Fs9.2±0.5Wo48.7±0.5, n=4); Magnetite (Cr2O3=3.6±0.3wt%, n=6).

Classification: Carbonaceous chondrite (CK6 C-S2 wi-2). Based on chondrule diameters, mineral compositions, presence of Cr-bearing magnetite and texture, sample is a CK6.

Specimens: Adrián Contreras Gómez (CRATER meteorites) holds the main masses. A polished thin section and 2 partially crusted individuals weighing 23.34 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2022
Mass (g):1122
Shock stage:C-S2
Weathering grade:wi-2
Fayalite (mol%):31.8±0.2
Ferrosilite (mol%):27.0±0.3; 9.2±0.5
Wollastonite (mol%):0.9±0.1; 48.7±0.5
Magnetic suscept.:4.73
Classifier:A. Love, App
Type spec mass (g):23.34
Type spec location:App
Main mass:Adrián Contreras Gómez (CRATER Meteorites)
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. 112, in preparation (2023)
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     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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