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a succession of beds of ore interstratified with layers of greenish talcoid 

 slate and of crystalline limestone, with which were also met serpentine, 

 chlorite, diallage, and a greenish epidotic rock. Iron of a superior 

 quality was manufactured from this deposit. 



Pyrallolite, a mineral similar to steatite in chemical composition, 

 softness, and refractory properties, is often met with in the Laurentian 

 series. A bed of it, associated witb serpentine, occurs between the 

 gneiss and the limestone on lot 13, range 5, of Grenville. It may be 

 traced thence into range 6, and appears to be in considerable quantity. 

 The colour of this mineral is generally greenish -white or sea-green ; 

 some varieties of it are nearly white and have the translucency of porce- 

 lain. Very dark-coloured, nearly black varieties, have been described 

 by Dr. Emmons, who says this mineral is capable of being turned in a 

 lathe and wrought like soapstone, and has been made into small vases, 

 inkstands and similar objects. Much of the figure-stone, or pagodite, of 

 which the Chinese carve various ornaments, appears to be pyrallolite. 

 It was used by the aborigines to make pipes and calumets. 



The serpentine of lot 13, range 5, Grenville, and of some parts of 

 the Township of Burgess, is of a pale-green colour, marked with spots of 

 iron, and forms a fine ornamental stone. 



The limestones of the Laurentian series are very important, not 

 only on account of their extent, or their association with serpentine 

 and apatite, but from the fact that wherever they occur the Laurentian 

 region presents fine fertile valleys fit for cultivation. The principal 

 settlements found among these rocks are upon the outcrop of the lime- 

 stone bands. These limestones afford excellent lime as well as good 

 materials. 



The Laurentian serpentine on account of being light in colour in 

 many places could be ground, and subsequently impregnated, by a 

 peculiar process, with various mineral and vegetable colour, and then 

 used for the manufacture of cheap and durable paints of various hues. 



HURONIAN SERPENTINES. 



These are but little known and of very limited extent. 



Messrs. Bailey and Matthew report as follows of a series of rocks 

 of Charlotte County, New Brunswick, which they suppose to belong to 

 the Laurentian system : — 



