AM_Chromdravite_1 Formula: Na.892 Ca.068 K.017 Cr4.029 Mg2.322 V.243 Fe.036 Ti.03 Al2.364 Si5.976 B3 O30.668 F.332 H2.982 Name: Chromdravite Unit cell: 16.0377 16.0377 7.3157 90.0 90.0 120.0 , V=1629.56 Space group: R3M (160)

Bosi F , Lucchesi S , Reznitskii L , European Journal of Mineralogy , 16 (2004) p.345-352, Crystal chemistry of the dravite-chromdravite series, Note: Tourmaline TMt6b, Locality: Sludyanka crystalline complex, Lake Baikal, Russia