NWA 032
...is a volcanic rock. We can readily see this from its texture, the way crystals are intergrown. As seen in the element map below, NWA 032 contains larger (up to 0.3 mm across) crystals of the minerals olivine and pyroxene set in a much finer-grained matrix of pyroxene, plagioclase, ilmenite, and assorted other minerals. The matrix (also called groundmass) has a texture indicative of rapidly-cooled lava. Besides the igneous minerals, NWA 032 also has weathering products--not from the Moon, but from northwest Africa. They consist of mostly calcium carbonate and a smaller amount of calcium sulfate.
Accueil 
S'enregistrer 
Connexion 
Sujet: Météorite # 1008 : NWA 032 
Ven 2 Avr - 16:49
