W. E. Ford — Chemical Composition of Axinite. 199 



was well justified in deriving his formula from the analysis. 

 As shown below, by combining the hydrogen with the bases, 

 the analysis also conforms very well with the new formula, 

 the ratio being 8 : 0*88 : 1*97 : 6*83, or approximately 8:1:2:7. 

 Analysis of axinite from Bourg d'Oisans by Bammelsberg. 



SiO 



43-46 



Eatio. 



•724 

 •080 

 •161 ) -_ 



~ -090 



= 8-00 



B 



5*61 



= 0-88 



Al 0, 



16-33 





Fe 2 3 — - 

 FeO 



280 



6-78 



•017 l 



•094^ 



•037 



•360 



•043 



•001 



•080 j 



• '178 



= 1-97 



MnO 



CaO 



MgO 



Ko 



H'O 



2-62 



20-19 



1-73 



0-11 



1-45 



>■ '615 



= 6-83 













10108 



The analyses of Whitfield* — Analyses were made by Whit- 

 field, on material from Cornwall and Bourg d'Oisans. From 

 the second of these analyses the formula, BR III 3 B. II 4 EL 2 (Si0 4 ) 5 

 was derived, which is quoted in a somewhat different form by 

 Dana and Hintze. These analyses have been recalculated and 

 the resulting ratios are given tirst according to Whitfield's 

 formula and second according to the new interpretation. 

 While the results are unsatisfactory in either case, they will be 

 found to agree more closely with the new formula than with 

 that proposed by Whitfield. 



I. Axinite from Cornwall, by Whitfield. 



Si0 2 ._ 



ai 2 o 3 



Fe 2 3 

 FeO . 

 MnO . 

 CaO .. 

 MgO. 

 H a O._ 



42-10 



4-64 

 1740 



3-06 

 5-84 

 4-63 

 20-53 

 •66 

 1-80 



100-66 



Eatio. 

 701 

 066 

 169 

 019 



•070 



According to 

 Whitfield. 



10-00 or 10-00 



0-94 



•188 



•081 S 

 065 I 



366 !^28 

 016 j 

 100 



= 2-68 



= 7-54 



1-00 

 3-00 



8-00 



= 1-43 2-00 J 



According to 

 new formula. 



•087 = 8-00 or 8*00 

 = -75 1-00 



= 2-16 2-00 



= 7*21 



7-00 



* This Journal (3), xxxiv, 286, 1887. 



