NWA 12874  (8,407 g)

NWA 12874 (8,407 g)

Northwest Africa 12874 (NWA 12874)

(Northwest Africa)

Purchased: 2019

Classification: Primitive achondrite (Winonaite)

History: The meteorite was purchased from a Morrocan meteorite dealer on the meteorite fair in Ensisheim, France.

Physical characteristics: Three dark brownish fragments with some fusion crust.

Petrography: The meteorite displays a recrystallized texture dominantly composed of typically 100 to 200 µm sized enstatite, forsteritic olivine, and augite grains, with enstatite being the most abundant mineral phase. Augite often contains low-Ca pyroxene exsolutions. 120 degree triple junctions are abundant. Minor phases include kamacite, schreibersite, and troilite. Contains veinlets of metal or Fe-oxide throughout. Neither feldspar nor chondrules were observed.

Geochemistry:

olivine: Fa3.3±0.1 (Fa3.2-3.4 FeO/MnO=15±1, n=13);

low-Ca pyroxene: Fs3.6±0.4Wo1.4±0.2 (Fs3.3-4.5Wo1.2-1.7, FeO/MnO=10±1, n=13);

Ca-pyroxene: Fs1.7±0.4Wo45.4±0.4 (Fs1.2-2.3Wo44.6-46.3, FeO/MnO=8±3, n=13);

feldspar: An11.5±0.3Ab83.5±0.6Or5.0±0.7, n=17

 

Place of purchase: Ensisheim, France
Date: P 2019
Mass (g): 192
Pieces: 3
Class: Winonaite
Shock stage: S1
Weathering grade: W2
Fayalite (mol%): 3.3
Ferrosilite (mol%): 3.6; 1.7
Wollastonite (mol%): 1.4; 45.4
Magnetic suscept.: 4.75
Classifier: A. Greshake, MNB
Type spec mass (g): 24.6
Type spec location: MNB
Main mass: Hanno Strufe
Comments: Submitted by Ansgar Greshake

 

 

    168,00 €Preis
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