AM_Chromdravite_2 Formula: Na.842 Ca.043 K.027 Cr3.372 V.783 Mg2.085 Al2.856 Fe.027 Zn.009 Ti.003 Si5.868 B3 O30.639 F.361 H2.937 Name: Chromdravite Unit cell: 16.0299 16.0299 7.3056 90.0 90.0 120.0 , V=1625.73 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 TMt3c, Locality: Sludyanka crystalline complex, Lake Baikal, Russia