CLASSIFICATION OP MINERALS. 



773 



Grouj) 25. 



Grouj) 29. 



"Akermanite." Ca^SisOm. 



Melilito. 1 Mixtures of "akermanite" and geblenite in wbicb 

 Fuggerite.J part of tbe Ca is replaced by Mg and Fe. 



Gehlenite. CasAUSi.O,,,. 



Group 30. 



MgCa5(A10H)Al,(Si04)r,. 



Vesuvianite. 

 Xanthite. 

 Cyprine. 



Zircon. 



Tacbyapbaltite. 

 Auerbacbite. 

 Cyrtolite. 

 Alvite. 



Tborite. 



Calciothorite. 1 

 Eucrasite. [ 

 Freyalite. i 



Auerlite. ) 



Danburite. 

 Barsowite. 



Group 31. 

 ZrSiO^. 



Alteration jirodncts of zircon. 



ThSiO,. 



Alteration products of tborite. 



Group 32. 



CaB.2(Si04)2. 

 CaAl,(Si04)2. 



Tetragonal. 

 Tetragonal. 

 Tetragonal. 



Tetragonal. 

 Tetragonal. 



Tetragonal. 



Ortborbombic. 

 Ortborboinbic. 



