1823.] the same Crystalline Form as Pyroxene. 227 



the oxygen of all the bases being equal to one half of that of 

 the silica. 



Green Malacolite from Bjormyresoeden, in Dalecarlia. 

 Its colour is leek-green; the powder greenish-yellow; it is 

 semihard in a high degree ; and on the edges scarcely translu- 

 cent. It occurs in magneticaliron ore. The analysis gave the 

 following result : 



Silica 54-08 containing oxygen 27-20 



Lime 23-47 6-59 



Magnesia 11 '49 4-45 



Protoxide of iron 10-02 *** 



Protoxide of manganese 0*61 



99-67 

 Green Malacolite from Bjormyresoeden, another Variety. 

 It is scarcely different from the former in hardness, colour, 

 transparency ; in streak and lustre ; it is in fact almost completely 

 like the former. The analysis gave the following result : 



Silica 54-55 containing oxygen 27-45 



Lime 20-21 5/68 



Magnesia 15-25 5-90 



Protoxide of iron 8-14 l*o5 



Alumina 0-14 



Oxide of manganese . . 0-73 



99-02 



Black Crystallized Pyroxene from Taberg, in Wermeland. 



Its colour is raven-black ; the powder greyish-green ; it is 



semihard; opaque; occurs on a bed of iron ore with epi- 



dote, asbestos, and tremolite. The analysis gave the following 



result : 



Silica 53-36 containing oxygen 26-84 



Lime 22-19 6-23 



Protoxide of iron 17-38 3-95 



Magnesia 4-99 1*93 



Manganese 0-09 



98-01 



If the magnesia is not taken into consideration, this pyroxene 

 belongs to the second division. Even in external appearance, it 

 is like the hedenbergite, which belongs to that division. 



Green Sahlitefrom Sahla. 

 The colour is light oil-green; the powder white. It gives 



<J2 



