19S W. E. Ford — Chemical Composition of Axinite. 



196. Here, again, water is not present in sufficient quantity 

 to give a ratio of Si0 2 : H 2 = 8:1, but when added to the 

 protoxide bases the ratio of Si0 2 : RO becomes nearly 8 : 7. 



Analyses of axinite from Franklin, ~N. J., by Genth,* with 

 corrected H 2 0. % 



I. Crystalline Axinite. 



Eatio. 



•712 



•073 



•162 ) 



•006 j 



•001 ] 



•018 | 



•193 I 



SiO„ 



b,o; 



A1 2 3 



Fe 2 (X 



CuO ' 



ZnO 



MnO 



MgO 



CaO 



H 2 



42 

 5 



16 

 1 

 

 ] 



13 

 



18 

 1 



77 

 10 

 73 

 03 

 12 

 48 

 69 

 23 

 25 



•005 

 •326 j 

 29 (corrected) -072 J 



•615 



-4- '089 = 8-00 

 = 0-82 



= 1-88 



= 6-91 



100-69 



Water as given by Genth, 0*76. 



SiO, . 

 BA 

 A1A 

 Fe 2 3 

 PbO . 

 CuO . 

 ZnO . 

 MoO 

 MgO 

 CaO . 

 HO . 



42 



47 



5 



05 



16 



85 



1 



16 







•09 







11 



1 



53 



13 



14 







•26 



18 



•35 



1 



21 



II. Lamellar Axinite. 

 Ratio. 



•707 

 •072 

 •163 

 •007 



•001 

 •019 



•185 

 •006 

 •327 

 •067 



-*- -088 



170 



} -605 



= 8-00 



= 0'82 



= 1-93 



6-87 



(corrected) 



100-22 



Water as given by Genth, 0*40. 



Analysis of axinite from Bourg oVOisans by Rammels- 

 berg.\ — From the analysis given beyond Rammelsberg derived 

 the formula HK n 3 K nI 2 B(Si0 4 ) 4 which differs but slightly from 

 that obtained from the new analyses ; thus by combining the 

 hydrogen in Rammelsberg's formula with the bivalent bases 

 and multiplying by two the formulas become identical. Eam- 

 melsberg's formula is the simpler of the two, but it cannot be 

 accepted, as the new analyses never show sufficient hydrogen 

 to satisfy it. Moreover in Rammelsberg's analysis the ratio of 

 SiO B : H 2 is 8 : 0*88, not quite 8 : 1, vet so nearlv so that he 



* Loc. cit. f Zs. 



, yet so nearly so that 

 G. Ges., xxi, 689, 1869. 



