784 



Fergiisonite. 



Kuthcrforilito. 



Kocbelitc. 



Arrbouite. 

 Sipylito. 



Columbite. 



Mauganocolnmbito. 

 Tautalito. 



M an ganotantali te. 

 Tapiolite. 



Mossite. 



Adcliibolito. 



REPORT OF NATIONAL MUSEUM, 1897. 



(iroup ,)'. 

 (Y,Er,Ce)(Cb,Ta)0,. 



ErCb04. 



Group 4. 



Fe(Cb03)i. 



Fe(Ta03).2. 



(Fe,Mn)[(Cb,Ta)0:,]2. 



OXYGEN SALTS: CLASS, — NITRATES. 



Tetiagoual. 



Tetragonal. 



Ortboibouibic. 

 Ortboibombic. 

 Tetragoual. 



The nitrates, derivatives of HNO3, or compo uds of oxides with 

 oxides wliose negative portion is nitrogen peutoxide, are few and are 

 cliiefly salts of sodium, potassium, calcium, and magnesium. There is 

 a single basic cuprous species and a few double salts. 



OXYGEN salts: CLASS, — VANADATES. 



The vanadates, derivatives of 1I3V()4, include those minerals in 

 which vanadium pentoxide constitutes the negative portion. The prin- 

 cipal vanadates are vanadinite, a combination of a lead vanadate and 

 chloride, and descloizite. a basic lead vanadate carrying zinc. 



Pucherite. 



Vanadinite. 

 Endlichite. 



Group 1. 



BiVO,. 



Group 3. 



(PbCl)Pb.,(V04)3. 

 r(PbCl)Pb.,(V04)3.-| 



L(PbCl)Pb,(A80,):!j 



Orthorhombic. 



Hexagonal. 

 Hexagonal. 



