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NWA 12757 (32,131 g)

NWA 12757 (32,131 g)

Northwest Africa 12757 (NWA 12757)

(Northwest Africa)

Purchased: 2015

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a local meteorite dealer in Morocco.

Physical characteristics: Grayish rock with some fusion crust.

Petrography: Monomict breccia composed of up to 6 mm sized mineral fragments which are predominantly exsolved pyroxene and calcic plagioclase. Pyroxene is either augite with low-Ca exsolution lamellae or vice versa. Plagioclase shows signs of recrystallization. Minor phases include Fe-rich olivine, silica, FeS, chromite, and barite; no metallic Fe has been found. Contains shock melt.

Geochemistry: low-Ca pyroxene: Fs65.7±2.4Wo2.9±0.8 (Fs60.3-67.6Wo2.2-4.9, n=12, FeO/MnO=25-34); Ca-pyroxene: Fs29.3±2.5Wo42.5±0.7 (Fs26.4-32.6Wo40.6-43.0, n=11, FeO/MnO=29-35); olivine: Fa81.6±3.2 (Fa75.6-84.8, n=19, FeO/MnO=37±7); calcic plagioclase: An90.7±1.1 (An88.2-92.0, n=12)


Place of purchase: Morocco

Date: P 2015

Mass (g): 298

Pieces: 1

Class: Eucrite

Shock stage: high

Weathering grade: low

Ferrosilite (mol%): 65.7; 29.3

Wollastonite (mol%): 2.9; 42.5

Classifier: A. Greshake, MNB

Type spec mass (g): 20.3

Type spec location: MNB

Main mass: Philippe Schmitt-Kopplin

Comments: Submitted by Ansgar Greshake


    350,00 €Preis
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