ORDER VI. GENEEA AND SPECIES. 



III. TRIPHANE-SPAR. Prismatic. 



Cleavage, somewhat more distinct in one 



direction. 

 Colour not blue. 

 H. - 6-0 ... 7-0. 

 G. = 2-8 ... 3-1. 



1. PRISMATIC. Prismatic. 



Cleavage, P + co = 93. Somewhat more distinct, 



Pr + co. 



H. = 6-5 ... 7'0. 

 G. = 3-0 ... 3-1. 



Spodumene. ii. 216. 



2. AXOTOMOUS. Prismatic. 



Cleavage, P + os = 99 30'. More distinct, P ee. 

 H. = 6-0 ... 7-0. 

 G. = 2-8 ... 3-0. 



Prebnite. ii. 217. 



IV. DYSTOME-SPAR. Prismatic. 



Cleavage difficult ; lustre of the fracture re- 

 sinous. 



Colour not blue. 

 H. = 50 ... 5-5. 



G. = 2-9 ... 30. 



* 



I. PRISMATIC. Hemi-prismatic. _ =1220 / . Inclina- 

 tion = 1 41' 30". 



Cleavage, P + wj= 71 30 7 , very indistinct ; a little 

 more distinct, Pr + co. 



Datolite. ii. 220. 



V. KOUPHONE-SPAR. Tessular, rhombohedral, 



pyramidal, prismatic. 



