2 THE ROYAL SOCIETY OF CANADA 



showed apparently the greatest freedom from the associated minerals 

 and carefully scratching away the fibres with a steel point, one could 

 feel and avoid the harder, gritty dolomitic portions. The areas 

 showing a yellowish or greenish colour due to chrysotile were also 

 rejected. In this way the sample for Analysis I (Borate) was obtained. 



The purest layer of dolomite in the specimen from which the 

 borate sample I was obtained was broken out, crushed, and as much 

 as possible of the fibrous material removed under the binocular. 

 It was then crushed fine and sifted on a 200 mesh sieve. Most 

 of the remaining fibrous material was left on the sieve and the dolo- 

 mite powder which passed through was used as the material for 

 Analysis II. 



The sample of chrysotile analyzed (III) was obtained from a 

 layer in the same specimen from which the borate and dolomite were 

 taken. It was carefully worked over under the binocular and appeared 

 to be quite free from borate, but contained a little dolomite. 



The three samples were carefully analyzed in duplicate, direct 

 determinations being employed for all constituents, with the following 

 results: 



BOR.\TE 



% 



II 



Dolomite % 



CaO 29.05 



MgO 20.98 



FeO 0.29 



MnO 0.66 



AI2O3 0.09 



CO2 46.10 



H20+110° 0.69 



H20-110° 0.03 



SiOs 1.15 



MgO 1.01 



B2O3 trace 



100.05 



III 



' Chrysotile % 



SiOo 39.95 



MgO 41.43 



Fe.Os 1 . 44 



FeO 0.13 



AI2O3 0.32 



MnO 0.06 



CaO 0.75 



Cr.Os 0.01 



CO2 1.15 



H20+110° 13.04 



HaO-llO" 1.80 



NiO 



^^^0 ;...... traces 



NaoO 



B2O3 j 



100.08 



100.12 



