QKDKIl VIII GEXEUA A\JD SPECIES. 437 



1. PRISMATIC. Prismatic. 



Cleavage, P + co = 125 (nearly). Traces of Pr + oo. 

 Prismatic Zinc-Ore. J. ii. 380. 



III. COPPER-ORE. Tessular. 



Streak brownish-red. 

 H. = 2-5 ... 4-0. 

 G. = 5-6 ... 6-0. 



1. OCTAHEDRAL. Tessular. 

 Cleavage, octahedron. 



Octahedral Red Copper-Ore. J. ii. 381. 



IV. TIN-ORE. Pyramidal. 



Streak not black. 

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

 G. = 6-3 .,. 7-1. 



1. PYRAMIDAL. Pyramidal. P = 133 26', 67 59'. 

 Cleavage, P + oo. [P + oo]. 

 Streak uncoloured ... pale brown. 



Pyramidal Tin-Ore. J. ii. 384. 



V. SCHEELIUM-ORE. Prismatic. 



Streak reddish -brown, dark. 

 H. =50 ... 5-5. 

 G. = 7-1 ... 74. 



1. PRISMATIC. Hemi-prismatic. LZT_1 = 62 40'. In- 

 clination = 0. P + oo = 101 5'. 



Cleavage, P r + co, perfect. 



Prismatic Wolfram. J. ii. 387. 



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VI. TANTALUM-ORE. Prismatic. 



Streak brownish-black. 



