78 



OF CENTRAL CANADA PART II. 55 



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



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



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



1 becoming opaque on cooling 78 



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

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



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

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



BB, no sulphur-reaction , t 79 



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



79 < hydrochloric acid APATITE (No. 103. ) 



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



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



| N r o water on ignition , 80 bis. 



80 bis \ Soluble with stron g effervescence in cold acids. . .CALCITE (No. 88.) 



I Effervescing strongly only in heated acids. . . DOLOMITE (Xo. 90.) 



MAGNESITE (No. 91.) 



g, j 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 



52 MICAS (Nos. 77 and 78. ) 

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

 metallic lustre TALC and STEATITE (No. 82.) 



53 j Fibrous, in soft silky masses.. CHRYSOTILE or FIBROUS SERPENTINE (No. 83. ) 

 I Foliated or compact 84 



04 ( Foliated or scaly 85 



( 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 eckes 



CHLORITE (No. 80.) 



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



36 j (page 34) SERPENTINE (No, 83.) 



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



FINITE (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 : 



-^ ( Aspect metallic or sub-metallic 2 



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



