Dear Scientists, I wish you have a nice time. Please, I would like to know your opinion about the presence of very coarse pyroxmangite within pegmatites associated with-A-type granites. Pyroxmangite occurs as coarse-grained massive blocks, network veins, and as disseminated crystals within pegmatites.
The main question is: What is the source of Mn?
Please, see teh attched photos.