AM_Gaudefroyite_8 Formula: Ca4 B3 Mn3 C O15 Name: Gaudefroyite Unit cell: 10.65448 10.65448 5.91703 90.0 90.0 120.0 , V=581.70 Space group: P63/M (176)

Antao S M , Hassan I , The Canadian Mineralogist , 46 (2008) p.183-193, Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure, Locality: Wessels mine, Kalahari manganese field, South Africa, Sample: T = 350 C