NWA 12830 ( 3,461 g )

Northwest Africa 12830 (NWA 12830)
(Northwest Africa)
Purchased: 2019
Classification: Lunar meteorite
History: The meteorite was purchased from a local meteorite dealer in Morocco.
Physical characteristics: Grayish rock partly covered with fusion crust.
Petrography: The meteorite is a recrystallized melt breccia displaying a poikilitic texture of olivine, pigeonite, and augite up to 50 μm in size enclosing calcic plagioclase. Some plagioclase grains exhibit mechanical twinning, show strongly undulating extinction, and contain planar deformation features. Maskelynite has not been observed. Minor phases include silica, FeS and FeNi-metal. The meteorite is fractured and contains abundant shock melt veins and pockets.
Geochemistry: olivine: Fa31.8±1.6 (Fa30.3-34.0, FeO/MnO=100±5, n=11); pigeonite: Fs28.6±0.4Wo7.6±0.5 (Fs28.2-29.1Wo7.1-8.5, FeO/MnO=58±2, n=10); Ca-pyroxene: Fs17.9±0.9Wo36.8±1.4 (Fs16.7-19.6Wo35.1-39.0, FeO/MnO=46±6, n=11); calcic plagioclase: An95.4±1.3 (An92.9-97.1, n=11)
Classification: Lunar (anorthositic melt breccia)
 
Place of purchase:
Morocco
Date:
P 2019
Mass (g):
232
Pieces:
1
Class:
Lunar
Shock stage:
moderate
Weathering grade:
low
Fayalite (mol%):
31.8
Ferrosilite (mol%):
28.6; 17.9
Wollastonite (mol%):
7.6; 36.8
Classifier:
A. Greshake, MNB
Type spec mass (g):
20
Type spec location:
MNB
Main mass:
Philippe Schmitt-Kopplin
Comments:
Submitted by Ansgar Greshake