300 PHYSIOGRAPHY. ClASS II. 



P H- oo (s) ; (P 4- oo) 5 = 133 1(X 25", 166 



49' 35". 



Char, of Comb. Rhombohedral. 

 Combinations. 1. R QD. R. Sim. Fig. 111. 

 Gellivara, Sweden. 



2. R oo. P -f GO. Malabar. 



3. R GO. R. P-hx. Ceylon. 



4. R oo. R. P + l. P-f oo. Fig. 121. Ceylon. 



5. P+l. R+ 1. P + 2. P+ oo. Fig. 122. Ceylon. 



6. R oo. ^P-f-1. |P + 3. P + 3. P+o>. 

 Fig. 123. Ceylon. 



Irregular forms, grains. 



Cleavage, R CD in some varieties perfect, but in- 

 terrupted by conchoidal fracture. The faces ob- 

 tained in the direction of the rhombohedron R, 

 almost always originate in composition. The 

 faces of cleavage and regular composition are 

 striated parallel to their common edges of in- 

 tersection. Fracture conchoidal, uneven. Sur- 

 face, R CD striated parallel to the edges of 

 combination with R ; sometimes also P -f oo in 

 the same direction. The isosceles pyramids and 

 generally also P -|- oo are often deeply striated 

 in a horizontal direction. 



Lustre vitreous, much inclining in some varieties 

 to pearly upon R QD. Colour blue, red, 

 green, yellow, brown, grey, and white. Some of 

 the blue, red, and yellow colours, very lively 

 and beautiful. Streak white. Transparent 

 ... translucent. In several varieties, if cut round, 



