Ich kann Euch NWA 10403, einen frischen und sehr schönen Diogeniten (polymict breccia) präsentieren:
Northwest Africa 10403 (NWA 10403)
Purchased: 2015 Jun
Classification: HED achondrite (Diogenite, polymict)
History: Purchased by Aras Jonikas in June 2015 from a Moroccan dealer.
Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed mostly of diogenitic clasts and debris, plus <10 vol.% eucritic debris and lithic clasts (with intersertal to recrystallized tetxtures). Minerals are orthopyroxene (with several different compositions), calcic plagioclase, exsolved pigeonite, silica polymorph, chromite and troilite.
Geochemistry: Diogenitic orthopyroxene (Fs22.4Wo2.1; Fs34.2Wo2.2; FeO/MnO = 34, N = 2), orthopyroxene host (Fs58.3Wo3.8, FeO/MnO = 29), clinopyroxene exsolution lamella (Fs29.2Wo41.5, FeO/MnO = 30), orthopyroxene host (Fs48.5Wo2.2, FeO/MnO = 20), clinopyroxene exsolution lamella (Fs21.8Wo39.6, FeO/MnO = 19).
Nachstehend Fotos von 2 verschiedenen Scheiben: