276 PHYSIOGRAPHY. CLASS n. 



2. _. (Pr + x) 3 . Pr + x. Pr + x. Sim. 

 Fig. 72. (Tremolite) St Gothard. 



3.?.. ^. (Pr+x) 3 . Pr+OD. Fig. 74. 

 2 /w 



Teplitz, Bohemia. 



4, ?_. VfZ, _^. (Pr+x) 3 . Pr+x. 



C% o i^> V * 



Pargas, Finland. 



5. -. ?. !t21. (Pr + x) 3 . Pr + x. 

 222 



Teplitz. 

 6 P |Pr + 2 (P) 3 (Fr) 5 _Pr .^(Pr)^ 



O O Q 6> O C) 



?r + OD. Pr + oo. Fig. 76. Vesuvius. 



Cleavage, (?r + oo) 5 highly perfect, less distinct 

 Pr -f oo, least of all Pr -f- OD. Fracture imper- 

 fect conchoidal, uneven. Surface, sometimes 

 striated parallel to the axis ; sometimes all the 

 faces are uneven. 



Lustre vitreous, inclining to pearly upon faces of 

 cleavage in the varieties possessing pale colours. 

 Colour, various shades of green, often inclining 

 to brown ; there is an uninterrupted series into 

 perfectly white and into black varieties. Streak 

 greyish-white ... brown. Nearly transparent 

 ... opake.* 



* There is sometimes a blue opalescence observable in the 



