8 ' THE ROYAL SOCIETY OF CANADA 



must have taken place during or following its formation. The 

 camseliite and also the dolomite are so intimately associated with the 

 chrysotile that they appear to be but little later in order of formation 

 and probably are contemporaneous, geologically speaking. It may 

 be noted, however, that MnO is low in chrysotile, higher in the dolomite 

 and still higher in the borate apparently indicating that the borate 

 was the latest. This conclusion is supported by the evidence of 

 structures observed in thin sections which leave little doubt that the 

 order of deposition is as indicated, chrysotile first followed by dolomite 

 and finally borate. The camseliite was, no doubt, formed by replace- 

 ment of the silicic acid of the serpentine by boric acid. The boric 

 acid may have come either from volcanic action or from the granite 

 intrusion. Geological evidence would appear to rule out the Miocene 

 volcanics as the source of the boric acid of camseliite, and we must 

 ascribe its origin either to contemporaneous volcanic action during 

 the Cache Creek period, to the volcanics of the Nicola formation or to 

 pneumatolytic action from the granite intrusion. 



At the suggestion of R. A. A. Johnston the mineral has been 

 named in honour of Chas. Camsell of the Geological Survey in recogni- 

 tion of his valuable contributions to our knowledge of the geology of 

 British Columbia. 



