OF CENTRAL CANADA PART II. 55 



.,. ( Crystallization, Tetragonal (p. 15.) Apophyllite (No. 76.) 



f I Crystallization, Rhombic (p. 16.) Thomsonite (No. 70.) 



BB, very easily dissolved by borax or phosphor-salt, the saturated glass 

 becoming opaque on cooling 78 



BB, slowly and incompletely dissolved by borax or phosphor-salt, a 

 " silica skeleton" (p. 39) separating in the latter flux. 81 



77 



( BB, with carb-soda and silver foil (p. 44) yielding strong sulphur-reac- 

 78 J tion ............. Light coloured varieties of ZINC BLENDE (No. 13. ) 



( BB, no sulphur-reaction ..... , .................... , ............ ... 79 



SH = 5.0. Soluble (in powder) without effervescence in heated nitric or 

 hydrochloric acid. ....................... APATITE (No. 103. ) - * 



H = 3.0 3.75. Soluble with strong effervescence in heated acids. . 80 



sft j Yielding water by ignition in bulb-tube ............. Dawsonite (No. 94.) 



\ No water on ignition ......................................... 80 bis. 



cn , . \ Soluble with strong effervescence in cold acids. . .CALCITE (No. 88.) 

 s | Effervescing strongly only in heated acids. . . DOLOMITE (No. 90.) 



MAGNESITE (No. 91.) 



81 ( Yielding merely traces of water on ignition (page 34) ................ 82 



( Yielding a considerable amount of water ....................... . . . 83 



Foliated or scaly. Thin leaves, elastic. Lustre, mostly pseudo-metallic 



MICAS (Nos. 77 and 78.) 



Foliated or compact. Not elastic. Soapy to the touch. No pseudo- 

 metallic lustre.. . ................. . .TALC and STEATITE (No. 82.) 



oo J Fibrous, in soft silky masses. . CHRYSOTILE or FIBROUS SERPENTINE (No. 83. ) 

 j Foliated or compact . ............................................. 84 



g . ( Foliated or scaly ................................. .............. 85 



j Granular or compact .................................... . ......... 86' 



( In soft nacreous scales of light colour. Becoming blue by ignition with 

 85 ] , nitrate of cobalt (page 34) ................... PHOLERITE (No. 84. ) 



( In dark-green foliated or fine scaly masses. Mostly fusible on the edges 



CHLORITE (No. 80.) 



( Assuming a pale-red or greyish colour by ignition with nitiate of cobalt 

 ,86 ] (page 34) ................................. SERPENTINE (No. 8.3.) 



f Assuming a bright-blue colour by ignition with nitrate of cobalt (p. 34. ) 



PINITE (No. 85.) 



APPLICATION OF THE ANALYTICAL KEY. 



The method of employing the above Key is shewn in the following 

 example. Let the reader be supposed to have a massive piece of 

 magnetic pyrites, of the name and nature of which he is ignorant. 

 Turning to the first bracket of the Key, he finds : 



j | Aspect metallic or sub-metallic ............................ 2 



| Aspect non-metallic (i. e., vitreous, stony, etc) .............. 35 



