t 



THE NATURAL ARRANGEMENT. XXXV11 



Gen. II. DIAMOND. (M.) 

 Sp. 1. Octahedral (M.) Diamond. 



Gen. III. TOPAZ. (M.) 

 Sp. 1. Prismatic (M.) Topaz. 



Gen. IV. EMERALD. (M.) H. 7-5... 8-0. G. 2-6... 3-2. 



Sp. 1. Prismatic (M.) Euclase. 



2. Rhombohedral (M.) Emerald. 



3. Pyramidal (S.) Chrysoberyl. 



4. Phenakine (S.) Phenakite. 



(NORDENSKIOLD.) 



Gen. V. QUARTZ. (M.) H. 5-5 ... 7-5. G. 1-9 . . .2-7. 

 Sp. 1. Prismatic (M.) Mite. 



2. Rhombohedra] (M.) Quartz. 



3. Uncleavable (M.) Opal 



4. Em py rod ox 49 (M.) Pitchstone. 



5. Isopyric (H.) Isopyre. 



Gen. VI. AXINITE. (M.) Color brown. H. 6-5 ... 7-0. 

 G. 3-0... 3-3. 



Sp. 1. Tetarto-pr i s m a tic (S.)xinite. 

 2. Pr is'matoid al (S.) Bucholzite. 



Gen. VII. CHRYSOLITE. (M.) 

 Sp. 1. Prismatic (M.) Peridot. 



Gen. VIII. BORACITE. 

 Sp. 1. Tetrahedral (M.) Boracite. 



49 E(jwruo, belonging 1 to fire, and ^oga, opinion. 



