362 Scientific Intelligence. 



ragdite, this variety is in regular composition with hornblende. It con- 

 sists of' 



Silica, - 



Lime. - 



Magnesia, - 



Protoxide of iron and protoxide of manganese, 



Alumina, - 



Water, - 



100.000 

 The mineralogical formula is C 

 M 



i 



/' 



mn 



2. Metalloidal Diallage from Salzburg. — Colour pale greenish-gray ; 

 hardness = 3. 75 ; spec. gr. = 3.21 . . . 3.23. Composition : 



Silica, - - 51.338 



Lime, - - 18.284 



Magnesia, - - 15.692 



Protoxide of iron' and manganese, 8.230 



Alumina, - - 4.388 



Water, ... 2.107 



4. Crystallized Diallage from the Baste. — Form like that of the augite; 

 the crystals are little, indistinct, and surrounded by the matrix ; spec. gr. 

 = 3.054. Composition: 



