282 A. P. Coleman — Antholite from JElzivir, Ont. 



In regard to the talc (No. 8) it should be mentioned that 

 most of the material effervesces slightly with acid, showing 

 the presence of a little calcite. If the GaO obtained in the 

 analysis (2*67 per cent) be reckoned as carbonate, and a corre- 

 sponding deduction made from the amount of loss at a red 

 heat for CO 2 (2*09 per cent), the result shows combined water, 

 4*53 per cent, silica 59*58, and magnesia 31*48. This corre- 

 sponds fairly with the usual composition. The amount of 

 pure substance available for analysis was 709 milligrams. 



The results of the first analysis of the mineral resembling 

 chrysotile were surprising, and the second analysis was made 

 to control the first. It was very difficult to obtain the fibrous 

 parts quite free from, talc, and the first analysis was made from 

 404*9 milligrams only, the material having been carefully 

 selected with a lens. For the second analysis a still smaller 

 quantity, 285*3 milligrams, was obtained by careful searching 

 with a lens. A third, still smaller quantity was used to deter- 

 mine the loss at read heat, in which the two previous samples 

 differed considerably. 



For comparison the loss on ignition was determined in 

 several other minerals, as in the following list. In all cases 

 the amount taken was heated in a platinum crucible over a 

 blast lamp. 



Fibrous mineral, No. 1, loss at red heat plus Per cent. 



hydroscopic moisture 5*41 ) -.* 



No. 2 7-92 I iV r; a ft n 



JSo. 3 6 "40 J 



Serpentinous mineral associated with the fibrous 



one 6-82 



Chrysotile, Thetford, Quebec ... 15-27 



Actinolite, Clarendon Tp., Ont. .. 293 



Actinolite, North shore L. Superior, Ont 2*35 



Talc, Grimsthorpe Tp., Ont. 4*58 



The fibrous mineral analyzed in Nos. 1 and 2 effervesces 

 scarcely at all with acid, so that no appreciable quantity of the 

 loss on ignition can be attributed to the driving off of car- 

 bonic acid ; but the fibers, which are greenish white in the 

 specimen, turn brown and brittle, very much as chrysotile 

 does, showing that combined water is driven off. 



The results of the analyses correspond quite closely with the 

 composition of enstatite, supposing its constituents to be rear- 

 ranged and hydrated. They come less close to the orthorhom- 

 bic amphiboles, such as anthophyllite, showing too little silica 

 and iron, and too much magnesia and water ; and they differ 

 widely from chrysotile;, having far too much silica and far too 

 little combined water and magnesia. In physical characters 



