OBDER VII. GENEKA AND SPECIES. 435 



Cleavage, Pr = os, perfect. 

 H. = 7-0 ... 7-5. 

 G. *= 3-3 ... 3-9. 



Staurolitc. ii. 366. 



XII. ZIRCON. Pyramidal. 



H. = 7-5. 



G. =. 4-5 ... 4-7. 



1. PYRAMIDAL. Pyramidal. =* 123 19*, 84 2<K 

 Cleavage, P. P + 03. 



Zircon. ii. 368. 



XIII. GADOLINITE. Prismatic. 

 Colour black. 



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

 G. = 4-0 ... 43. 



1. PRISMATIC. Hemi-prismatic.- 

 Cleavage almost none. 

 Fracture conchoidal. 



Gadolinite. ii. 371. 



Aflome. Ii. 364. 



Chondroditej iii. 87. 



Essonite. ji. 364. 



Fibrolite ? iL 99. 



Forsterite. iii. 102. 



Jfyalosiderite ? iii. 111. 



KnebeliteZ iii. 118. 



Ligurite? iii. 121. 



Mellilite? iii. 125. 



SphoeruliteZ iii. 155. 



Spmellanef iii. 156. 



Zeagonite. iiu 174. 



