4 THE ROYAL S0CIP:TV OF CANADA 



Evidently the chrysotile was only slightly, if at all, affected by the 

 treatment. 



The result of the recalculation for the dolomite after making 

 these deductions is shown in Table 1 1 A. 



In the case of the chrysotile (III) we may deduct all the CaO and 

 CO2 and the necessary amount of MgO to form dolomite. After 

 recalculation this gives results as in Table II lA indicating the presence 

 of about 2.41% of dolomite in the chrysotile sample as prepared for 

 analysis. 



We are now in a position to correct the borate analysis I for the 

 dolomite and chrysotile present. If we deduct all the CaO and CO2 

 along with the necessary MgO, H2O and minor constituents using the 

 CaO and CO2 as the bases of calculation we obtain for the dolomite 

 present in the borate mixture approximately 11.95% as indicated 

 below : 



CaO 3.69 



. MgO 2.45 



MnO 0.08 



FeO 0.04 



CO2 5.64 



H2O 0.05 



11.95 

 From the calculation the ratio of MgO: CaO in the dolomite 

 mixed with the borate is as 1:1.5 while in the dolomite sample II it 

 was 1:1.385. The slight excess of lime in this case, if not due to 

 analytical error, may indicate that a little of the CaO replaces some 

 MgO of the borate. 



Deducting in a similar way the Si02, MgO and H>0 and small 

 ■amounts of the minor constituents to form chrysotile we obtain for 

 the chrysotile present with the borate approximately 18.69% as 

 below : 



Si02 7.65 



MgO 7 . 84 



Fe.Os 0.27 



FeO 0.02 



AI2O3 0.06 



MnO 0.01 



H2O 110° 2.50 



H.O-llO" 34 



18.69 



