Dr. J. E. Reynolds on certain Mineral Silicates. 285 



Normal or Unisilicates. 



Class 1. \Si/ 



Forsterite Mg' /2 X° 2 



/o*\ 



= Si||0 4 ||Mg" 2 (Dana). 



\Si/ 

 Fayalite Fe" 2 X° 2 



\ Si / 

 Monticellite . (£Ca"44Mg'OV\ 02 



/o 2 \ 



Willemite Za'^Vo* 



\Si/ 

 Phenacite Be" 2 X° 2 



/0 2 \ 



Class 2. 



Garnet .... (W+W 2 /\° 6 



= Si||0 4 H(iR"-f-i/3R) 2 (Dana) 

 \ Si 



Grossularite . . aCa" 3 +AAl)V\0 6 



/0 6 \ 



\Si/ 

 Pyrope . (*(Mg", Fe", R 2 ) 3 +iAl) 2 Vo 6 



/0 6 \ 



Almandine 



/0 6 \ 





\Si/ 



Epidote . 



QCa" 3 +|(Fe,Al)) 2 X° 6 



/o 6 \ 





\Si/ 



Zoisite 



. . (^Ca" 3 +|A1) 2 X0 6 

 /0 6 \ 



\Si/ 

 Phlogopite mica(|(Mg ,/ K 2 ) 3 +^Al) 2 Xo 6 



/0 6 \ 



\ Si/ 

 Biotite mica (KMg", K 2 ) 3 +iAl) 2 Xos 



/0 6 \ 



