428 ill. BerzeUus on Isomorphism as [June, 



Of. Grossular C S -:- ^ S 



b. Aplonie C S + FS 



c. Almandine , f S •(- AS 



d. Magnesian garnet. 



e. Manganesian garnet, 



C 



/. Pyrope ^)>S + S 



Chr 

 C 



g. Mixed garnets ^r^ "*" F^ 



S 

 mnj 



Gehlenite 2CS + ^As 



Anthophyllite. 



Cerine (aUanite) CS + 2A S,ceS,fS 



Ml 

 Dichroite / \S' + S A S 



mnj 

 Nephrite, 



Steatite 31 S'' + A S'^ 



Sordanvalite M S'^ + 2 f S'' + S A S'^ 



Karpholite "'"|s + i A S + % Aq 



Siliceo-aluminates : Saphirin . . ^J^\ S + 5A^\ -f £* 



Chamoisite f A + 2fS 



8. Silicates of oxide of iron and alumina. 

 Staurotide •^^? S 



9. Silicates of glucina and alumina. 



Smaragdite (emerald) G Si + ^ A S' 



Euclase G S' + 2 A S 



Cymophane ? A* S + 2 G A^ 



10. Silicates of yttiia tvith silicates of iron, 

 cerium, ifc. 



Gadolinite. 



a. from Ytterby ce'' S + f S + 4 FS 



b, from Kararfvet 5 YJ'J^/'' "L" ^ 



{fS, u a, ce a 

 Orthite. 

 Pyrorthite. 



11. Silicates of zirconia, with other silicates. 



N-) 



f 1 

 Eudyalite Z yS 



"" I 

 j»nj 



Oxide of titanium (titanic acid) Ti 



a. Rutilite. 



b. Anatase. 

 Tilanales. 



a. Titanates of protoxide of iron. 



b. Titanates of oxide of iron. 

 Criclitonite. 



Polymignitc. * 



* From Fredricwern, in Norway. Tliis mineral is composed of titanic acid combined 

 with zirconia, lime, yttria, and the protoxides of iron, manganese, and cerium. It con- 

 tains besides, traces of potassa, magnesia, silica and oxide of tin. The name polymig' 

 nile signifies a mixture of many substances. 



