474 



MEASUREMENTS OF CRYSTALS. 



APATITE. (Continued.) 



Fig. 109. 



M one 150° 



Figs. 1 1 and 111, represent the rounded 

 terminations and bent prisms found at 

 Hammond, St. Lawrence county. 

 Fig. 112. A compound crystal from the 



preceding locality. 

 Fig. 113. 



Mono; ..., 129°13'53" 



P onx 140 46 7 



FLUOR SPAR. 

 243. 



Figs. 114 to 118 inclusive. Page 



Fig. 115. The primary, a regular octa- 

 hedron. 

 PonP' 109°28'16" 



Fig. 114, shows the manner in which the 

 cubes of flour spar cleave into octa- 

 hedrons and tetrahedrons. 



FLUOR SPAR. 



Fig. 117. The octahedron with the solid 

 angles replaced. 

 Pont 125015' 52" 



DATHOLITE. Figs. 119 and 120. Page 246. 



Fig. 119. The primary, a right rhombic 

 prism. 

 MonM' 103°40' 



PHARMACOLITE. Figs. 121 and 122. Page 247. 



Fig. 121. The primary, a right oblique 



angled prism. 

 Fig. 122. 



/on/ 117°24' 



P * to the edge between 



/and/ 83°14' 



71 on 71 141 8 



* Incorrectly s at page 257. 



