.Joliii8(riipitt3. 



^Mosandiite. 



Riiikitc. 



Astropliyllite. 



Dysanalyte. 



Hjulrotitanite. 

 Polymignite. 

 ^ILschyiiite. 

 Poly erase. 

 Euxenite. 



CLASSIFICATION OF MINERALS. 



Group 2. 



H2Nar,(Ca,Mg)i:.(Ce,Y,Al,Fe)F6 



(Ti,Zr):,Si|.20«. 



H,.2Na,Ca,„(Ce,Y)(OH,F)8 



(Ti,Zr,Ce)^Si..20^8. 



NayCaiiCesFsTiiSiiaO^g. 



a roup 3. 

 (H,Na,K)4(Fe,Mu)4(8i,Ti)50,6. 



C. COLUMBOTITANATES. 



(iroup 1. 



Na.(Ca,Fe)«TiioO,,Ce(CbO:0:i. 



Ce4(Ca,Fe).,(Ti,Zr)io0.29Ca(Cb03)> 

 Ce,(Ca,Fe)2(Ti,Th)«0,,Ce.(CbO;,)8. 

 (Ca,Fe),Y,(UO,)Ti,.2035Y,(CbO:Ofi. 



Fc(Y,Fr,Ce).2(UO)(Ti205)6. 



Fe(Y,Er,Co),(UO)(CbO:,)2. 



783 



Rloiioclinic. 

 Moiiocliiiic. 

 Mouocliuic. 



Orthorhombic. 



Isometric. 



Orthorhombic. 

 Orthorhombic, 

 Orthorliombic. 

 Orthorhombic. 



OXYGEN salts: CLASS, — COLUMBATES AND TANTALATES. 



The columbates and tantalates are derivatives of columbic and tau- 

 talic acids, HsRO^, H4K2O7, and HRO), or compounds of oxides with 

 oxides whose negative parts are taken by tlie oxides of columbiuni or 

 tantahnn. The intimate relations existing between these compounds 

 require them to be grouped together, there beiug in fact but few 

 native tantalates that do not contain more or less columbiuni. In the 

 formulas K = the oxides of the rare earths and uranium, calcium, iron, 

 etc. 



Pyrochlore. 

 Kojipite. 



Hatchettolite. 

 Microliti'. 

 Pyrrhite. 



Group 1. 



RCb,05.R(Ti,Th)03.NaF. 



5R.Cb.3O7.2NaF. 



2R(Cb,Ta),On.R.(Cb,Ta):07. 



[R2(.Ta,Cb).20r.2R(Ta,Cb);06].NaF. 



Isometric. 

 Isometric. 

 Isometric. 

 Isometric. 



droit p . 



Yttrotantalite. 



Samarskite. 



Nohilite. 



Blomstraiidite. 



Vietinghotite. 



Anueriklite. 



Rogersite. 

 Iliehuite. 



R2R,(Ta,Cb),0,5. 

 R3K2(Cb,Ta)60i,. 



RaXOi.jC?). 



Orthorhombie. 

 Orthorhombic. 



Orthorhombic. 



