780 



Deweylite. 



Irongymuite. 



Cerolite. 



Limbaehite. 

 Genthite. 



Garuierite. 



Pimelite. 



Alipite, 



Refdauskito. 



Rottisite. 



Konnarite. 



Talc. 



Steatite. 

 Sepiolite. 



Aphrodite. 

 Spadaito. 

 Saponite. 



Coladonite. 



Glauconite. 



Pbolidolite. 



REPORT OF NATIONAL MUSEUM, 1897. 



Group 70. 

 HH(MgOH).2Mg,(Si04)3.2Hi20. ( ?) 



Hfi(MgOH),(Mg,Ni),(SiO,).,.4H20. ( ?) 



Group 71. 



H.2Mg,(SiOn)4. 



H4Mg2Si30in. 



H3Mg,(Si,07)3. 



H4(MgOH).Si,07 



THE KAOLINS. 



Orthorhonibi c or 

 mouocliuic. 



(?) 



(?) 

 (?) 



The minerals iucluded in groups 72 to 75 are all earthy aluminous 

 silicates yielding water upon ignition, and as a rule result from the 

 decomposition of other aluminous minerals. With them is included a 

 group of hydrated silicates of iron and manganese which, like the 

 kaolins, are derived mainly from the breaking down of other minerals. 



Kaolinite. 



Rectorite. 



Leverrit-rite. 



Kaolin. 

 Halloysite. 



P.olc. 

 Moiitinorillonite. 



Razouniovskin. 



Severito. 

 Newtouite. 



Pyrophyllito. 



Agalmatolite. 



Pagodite. 



Giimbelite. 



Neiirolite. 



Biharite. 



Group 73. 

 H3Al(A10H)(Si04)2. 



H:,Al(A10H)(Si04),.H,0. 



Hr,(A10H)(SiO,)2.(H^O)„. 



H3Al(OH)iSi04.n.20. 



Group 73. 

 HAl(Si03)2. 



Monocliiiir. 



(?) 



Hexagonal ; rhora- 

 bohedral. 



Orthorbombic(?). 



