( io56 ) 



Deuxime type. Bisilicate S 2 O* R* : 



ther 160 degrs, allanite, amphodlite, anorlhite, bucholzite, sillimanite , cimolite, 

 disthne , chlorophate , zozite, fowlerite, gilbertite, gfickumite, grenat, harmotome, sis- 

 mondine, humboldtilite, indianite, ittnerite, manganse de Franklin, -williamite , kirvanite, 

 knbelite , lpidomlane , ilvate , olivine , pennine , phenakite , phonolite , picrosmine , polya- 

 delphite, prenhite , saussurite , spodumne, vsuviane, zircon , xnolite, tphrote , uwa- 

 rowite, schillerspath , smlite, hypersthne du Lab. 



Sous-types hydrats ou basiques Si 1 0' R* 

 b c 



nR'O 



Troisime type. Trisilicate S 3 5 R 4 : 



pistilbite, glaukolite, hydrophite, labrador, cume de mer, porzellanspath , ryakolite, 

 tachylite, bamlite. 



Sous-types Si 3 O s R +- nR 2 : 



Quatrime type. Quadrisilicate S 4 O 6 R* : 



ther 35o degrs , augite , diallage , hypersthne , amphibole , chromocre, leucite , skoli- 

 rite, sordawalite, weissite, wollastonite , wichtine , glaukophane , pimlite. 



