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Northwest Africa 12819
Basic information Name: Northwest Africa 12819
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12819
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 1022 g
Meteoritical Bulletin:  MB 108  (2020)  CK3
Recommended:  CK3    [explanation]

This is 1 of 75 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 3 Sep 2019
Writeup from MB 108:

Northwest Africa 12819 (NWA 12819)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CK3)

History: Marc Jost purchased this 1022g sample from Mokhtar Aithiba at Munich show 2018.

Physical characteristics: The sample has a rounded shape, with numerous chondrules and inclusion are visible on the exterior. The cut face shows the interior has a chondritic texture composed of dispersed chondrules and CAIs, set within a greenish-gray, fine-grained matrix.

Petrography: Description and Classification (A. Love, App) Sample is composed of ~39 vol%, 1364 im (avg. dia.) chondrules and CAIs in a matrix composed of olivine, pyroxene, zoned plagioclase and magnetite. BO and POP chondrules are dominant and many contain concentric clastic and igneous rims.

Geochemistry: (A. Love, App) Olivine chondrules Fa24.7±9.7 (Fa9.2-33.5), Fe/Mn=121.1±26.2, mean NiO in chondrule rims = 0.3 wt%, N=10; Matrix olivine Fa33.3±0.2, mean NiO =0.4wt%, N=8; low Ca pyroxene Fs10.1±8.3Wo2.0±1.8 (Fs1.8-24.6Wo0.6-4.0), N=7; high-Ca pyroxene Fs8.1±8.3Wo25.3±18.3 (Fs1.5-22.6Wo6.0-51.6), N=5 Plagioclase cores: An87.8±2.3Or0.1±0.1; rims: An30.7±5.3Or2.7±0.6, N=5.

Classification: Carbonaceous chondrite (CK3). Based upon chondrule size, oxidized composition of chondrule olivines, and presence Cr-bearing magnetite and NiO content of olivine, this sample is a CK. Based on unequilibrated compositions of olivine and pyroxenes, this sample is a type 3 CK chondrite. CK3 wi-3 C-S3

Specimens: Marc Jost (SJS) holds the main mass. A polished thin section and mount and 3 slices totaling 29.4 g comprise the type specimen which is on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2018
Mass (g):1022
Shock stage:C-S3
Weathering grade:wi-3
Fayalite (mol%):24.7±9.7; 33.3±0.2
Ferrosilite (mol%):10.1±8.3; 8.1±8.3
Wollastonite (mol%):2.0±1.8; 25.3±18.3
Magnetic suscept.:4.68
Classifier:A. Love, App
Type spec mass (g):29.4
Type spec location:App
Main mass:Marc Jost (SJS)
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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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