26o CLARKE 



Steiger, Steiger. Steiger. Steiger. McNeil. 



Chabazite. NH4 Salt. Ag Salt. Tl Salt. Na Salt. 



Si02 50. 7S 56.09 34.95 28. 92 54.77 



AI2O3 17. iS 19-49 II. 89 10.75 20.36 



Fe203 .40 



MgO 04 



CaO 7.84 2.01 .65 1.52 



Na,0 1.28 .24 .40 .28 17-42 



K,6 73 



(NHJ^O 7-39 



AgzO 39.63 



TI2O 51. 58 



H2O 21. 85 13.45 6.78 4.15 .28 



N2O5 6.64 3.54 



CI 1.35 6.92 



100.10 100.02 100.29 99-87 101.27 



Less O .30 1.56 



99.72 99.71 



From the molecular ratios the following formulae for chaba- 

 zite and its derivatives are deduced. 



Chabazite (Ca salt) R402^-^l«4Siiooo02807- 



NH^ salt R.;87 AL(,jiSiio(,o02786Cl3s- 



Ag salt R608'Alj02SiioooC>280s(^''03)u09- 



Tlsalt R5-0^-'^U36Sil000O2S7l(>^"O3)l:i7- 



Na salt R67/-^U:;sSiiooo0289-Cl202- 



The regularity of these ratios is disturbed by the presence of 

 the CI and NO3 radicles, whose functions will be considered 

 later. The barium chabazite, prepared by Mr. McNeil, shows 

 even greater irregularities, and uniform products were not ob- 

 tained. In one experiment the melt of chabazite and barium 

 chloride, upon leaching, yielded two products, one glassy, the 

 other flocculent, which were partially separable mechanically. 

 A second preparation was entirely glassy. The anal3'ses of 

 these products gave the subjoined results : (A) Glassy, first 

 preparation ; (B) flocculent, first preparation ; (C) second prep- 

 aration. 



A. B. C. 



SiOj 43-63 43.17 39-68 



AI2O3 17.12 21.24 16.31 



BaO 31.58 35.21 40.37 



CI 9-53 -55 .S-44 



101.86 100.17 101.80 



Less 2.15 .12 1.23 



99.71 100.05 100.57 



