AM_Chromdravite_3
Formula: Na.829 Ca.097 K.014 Cr3.9 Mg2.208 V.147 Fe.042 Ti.03 Zn.012 Al2.682 Si5.982 B3 O30.607 F.393 H2.82
Name: Chromdravite
Unit cell: 16.0204 16.0204 7.2985 90.0 90.0 120.0 , V=1622.22
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 TMpr79f, Locality: Sludyanka crystalline complex, Lake Baikal, Russia