200 DESCRIPTION AND ANALYSIS 



the results of the analysis, we have for the chemical 

 formula, 



4CaSi 2 +3MuSi 2 -f gjVSi 3 which gives us 



Silex . . . 20 atoms, containing 60 atoms oxygen. 

 Lime ... 4 8 



Protoxide cf Manganese 3 6 



Peroxide of Iron 2 6 



Which proportions are so near those of the results 

 of the analysis, that we may adopt them without he- 

 sitation. From this formula, we obtain the true com- 

 position of this mineral to be, 



4 at. Trisilicias Calcicus . 1 7619. 60 



3 at. Trisilicias Manganosus . 63; 3. 23 



2 at. Trisilicias Ferricus . . 5535. 38 



1 atom new mineral . . 19468. 21 



Or else 



20 Silex . . . 11928. 40 



4 Lime .... 2848. 24 



3 Protoxide of Manganese . 2734. 71 



2 Peroxide of Iron . . 1956.82 



.9468. 21 



Which reduced to 1,000 parts gives 



Silex . . . 0. 6125 contg. oxygen 3.0808750 30 



Lime . . 0. 1463 . . .4109567 4 



Protoxide of Manganese 0. 1404 . . .3080376 3 



Peroxide of Iron . 0. 1005 . . .3081330 3 



0. 9997 



This mineral will therefore present, in the new and 

 expressive language of Mr. Berzelius, 



