0111>E11 VI. GENEllA AND SPECIES. 421 



Laminae flexible. 



Streak uncoloured ... green. 



H. = 1-0 ... 1-5. 



G. = 2-7 ... 2-8. 



Prismatic Talc-Mica. J. ii. 193. 



2. RHOMBOHEDRAL. Di-rhombohedraL 

 Cleavage, R w. 

 Laminae elastic. 

 Streak uncoloured. 

 H. = 2 ... 2-5. 

 G. = 2-8 ... 3-0. 



Rhomboidal Talc-Mica. J. ii. 198. 



VI, PEARL-MICA. Rhombohedral. 

 H. = 3-5 ... 4-5. 

 G. = 3-0 ... 8-1. . 



1. RHOMBOHEDRAL. Di-rhombohedral. 

 Cleavage, R co. 

 Streak uncoloured. 



Margarite. ii. 204. 



Cronstedtite ? iii. 90. 



Hydrate of Magnesia. Chem. iii. . 1 1 2. 



Pyrosmalite. iii. 143. 



VI. ORDER. SPAR. 



I. SCHILLER-SPAB. Prismatic. 



Cleavage monotomous, eminent. 

 H. = 3-5 ... 6-0. 

 G. = 2-6 ... 3-4. 



