of Several Minerals. 245 



62. Common Actinolite, of Werner, from Breitenbrunn in 

 Saxony, 3.537 



The angles of the cleavage of this variety agree with those 

 of paratamous augite-spar. It is also composed in the same 



way parallel to Pr+ oo, and possesses the same hardness. Its 

 colour is a dark leek-green ; the specific gravity lies beyond 

 the limits usually assigned for the species. The jefFersonite 

 having been recognized by Troost and Keating to be a va- 

 riety of the paratomous Augite-spar, the common actinolite, 

 from Breitenbrunn, forms the second instance of a specific 

 gravity greater than 8.5 ; and we have thus reason to expect, 

 that many other varieties, like the one immediately preceding, 

 will be discovered, intermediate between these and the rest of 

 the augites, salites, mussites, &c. also in regard to this pro- 

 perty. 



63. Augite, blackish-green, perfectly cleavable, crystals com- 

 pressed between Pr+ oo , the faces marked r by Haiiy, and imbed- 

 ded in sodalite, from Greenland, 3.491 



This variety is associated with the arfvedsonite of Mr 

 Brooke, and intermixed with it in such a manner, that the 

 axes of the individuals of the two species are parallel, a case 

 frequently occurring in diallage, but produced there by a 

 similar composition of green varieties of paratomous and hemi- 

 prismatic augite-spar. 



64. Tremolite, white, crystalized, 2.931 



65. Actinolite, of a very pale-green colour, nearly alike to some 

 of the varieties of hemi-prismatic augite-spar, called tremolite, 



from Prcsnitz in Bohemia, 2.937 



66. Smaragdite, from Corsica, 3.000 



67. Hornblende, blackish-green, perfectly cleavable, 3.006 



68. Actinolite. thick leek-green crystals, from the Zillerthal, 

 Salsburg, 3.026 



69. Common Hornblende, perfectly cleavable, but showing faces 

 of composition, parallel to the long diagonal of the rhombic prism, 



and in consequence, called diallage, from Gulfield, Norway. 3.043 



70. Smaragdite, from the valley of Saass, 3.056 



71. Hornblende, black, perfectly cleavable, with smooth and 

 shining planes of composition, parallel to the long diagonal of the 

 prism, from Kongsberg, Norway, 3.114 



72. Car in thine, from the Saualpe, in Carinthia, 3.127 



