136 



the result of which (under III) is stated alongside of the ana- 

 lyses of the schizolite from Tu top A g die r к of i a (I) andNau- 

 jakasik (И), made by the same scientist and stated by 

 Winther. 



Ill 



per cent equiv. 



SiOj 51,06 0,851 Ч 



TiO., 0,68 0,008 / 



Ce., O3 1,47 0,004 



Y,0, - - 



FeO 2,79 0,039 



MnO 12,90 0,181 



CaO 19,48 0,348 



MgO — — 



Na^O 10,71 0,172^ 



Л,0. 



1,36 0,076 / 



From the above equivalents it will be seen that the ratio 

 between SiO» and BO is in all three analyses about as 3:2, 

 as in pectolite; on the other hand neither the quantity of Na^O 

 nor that of Na^O -\- H^O is in any invariable and simple ratio 

 to the other ingredients. For the three analyses the combina- 

 tion is about 



I. lb SiO^' 10 ÊO'i(Na,H)^0 



11. ZSiO^- 2'ÈO- {Na,.H),0 



III. Э^^гО,. ß'E0'2(Na,IJ)._0 



The combination given under II corresponds to the com- 

 mon pectolite formula, and 1 think it most natural to let it 

 apply also to schizolite, although all the analyses show an in- 

 sufficient quantity of -0^2^- 



To the formula bSiO^-IRO • (Na,H)^ where R = Mn 

 and Ca in the ratio 1:2, and Na and H are found in the 

 same equivalent, answers the following theoretical combination: 



52-7 per ct.A/Oo, VblUnO, 21-8 CaO, 9-iNa^O, 27 H^O. 



