186 Mr HAIDINGER on the Natural-Historical 



3.232, and its cleavage, exactly like that of all other varieties 

 of paratomous Augite-spar, to take place in the directions of 

 (Pr -f oo ) 5 = 87 33' (according to NORDENSKIOLD, = 87 42' ac- 

 cording to HAUY), and in those of its diagonals Pr-f- GO and 

 Pr + There is a face of composition still conspicuous in 



p * 



these varieties, but this face is parallel to -- 73 54' (ac- 

 cording to HAUY) in paratomous Augite-spar, as in the varieties 

 called Salite, some of the Mussite and common Actinolite of WER- 

 NER ; whereas in the hemiprismatic, we have found it parallel to 

 Pr -f- oo . Yet there exist varieties of paratomous Augite-spar, 

 which are likewise compound, parallel to the face of P f -f- co ; 

 this is the case in several Mussites, common Actinolite, &c. 

 The specific gravity of 3.350, mentioned by BREITHAUPT in 

 HOFFMANN'S Handbuch, after the authority of WERNER, for his 

 granular actinolite, refers to granular varieties of paratomous Au- 

 gite-spar, since it is comprehended between the limits of the spe- 

 cific gravity of paratomous, but not between those of hemipris- 

 matic Augite-spar. 



From these observations we may conclude, that green Diallage, 

 even in the most distinct varieties, is not a species of its own, 

 but that it consists of the varieties of two other species, of para- 

 tomous and hemiprismatic Augite-spar, into each of which it in- 

 sensibly passes, when the relative proportion of the other by 

 continual diminutions finally disappears. Yet a passage of this 

 kind never can entitle us to consider Smaragdite as the link which 

 would join the two species, and consequently prove them to be 

 but a single one ; it proves nothing else but that Smaragdite is a 

 mixture of both. This mixture of the two species in the per- 

 fectly foliated varieties of Diallage has been excellently described 

 by HAUY, in giving its geometrical character in the first edition 

 of his Traite, where he mentions that the single laminae are very 



