346 



CHEMICAL COMPOSITION OF MINERALS. 



Euclase (199), 



(i»e-H*l)Si*=3BeSi 



*+£lSi* 



Chrysoberyl (199), 



Be+Sl3 





Zircon (200), 



2rSi 





Yttrocerite (206), 



(Ca, Ce, Y)F 





Monazite (206), 



(Ce,La,Tii) 3 £ 





Allocate (see above). 







Rutile (210), 



Ti 





Sphene(211), 



(Ca+Ti)Si*=(fi)§i* 





Tin Pyrites (213), 



<3uS(Sn 2 S 3 , Fe 2 S 3 ) 





Tin Ore (214), 



Sn 





Molybdenite (217), 



MoS 2 





Molybdic ocher (218), 



So 





Tungstic ocher (218), 



W 





Scheelite (Tungstate of lime, 



219), Caw 





Gray Antimony (222), 



Sb 2 S 3 





White Antimony (224), 



Sb a 8 





White Arsenic (226), 



As 2 O 3 





Omimeut (226), 



As 2 S* 





Realgar (226), 



AsS 





Uranite (228), 



<VP>© 4 P+16S 





Chalcolite (229), 



Cu 2 P+^P+16£ 





Pyrites (231), 



FeS 3 





Pyrrhotine (233), 



Fe^Ss ; FeS. 





Mispickel (234), 



Fe(As, S) a 





Magnetite (235), 



Fe£e 





Specular Iron (237), 



£e 





Limonite (239), 



£e 2 £ 3 





Gothite (240), 



3>eH 





Franklinite (240), 



£n(#e,Sln) 





Ilmenite (241), 



(3Pe, Si) 





Chromic Iron (241), 



Fe(^r) 





Columbite (243), 



Fe 3 Cb 3 





Tantalite (ferrotantalite, 244), 



FeTa 





Wolfram (244), 



(Fe, Mn)w 





Copperas (246), 



FeS"+7fl 





Spathic Iron (247), 



FeO 





Vivianite (248), 



Fe'P+83 





Rhodonite (258), 



Mn 3 S> 





Pyrolusite (259> 



Mn 





