Mr. T. 8. Hunt on a new Titaniferous Mineral. 35 
Silicic acid, —. : ; at rd 18°5 
Peroxide of iron, ‘ , , ; 13-0. 
_ » Titanic oxide, 25°156 
Alumina, 13°84 
Magnesia, 22.2 
Lime, : F ‘ : ‘ : 13 
nti : ‘ E ‘ : ‘ 7°35 
101-346 
Which ceabetions carTeADOnG closely to 
Silicic acid, 
Peroxide of iron, . i 
ide of titanium, : it =16 2 
Alumina, . ‘ hie. Dees or 
Magnesia, . os #54 3 
ime, é ‘ : sg. 
Watery. cv) oo 1G 046 16 \. 
In determining the chemical formula for this mineral, it is 
probable that we must regard the oxides of iron, aluminum and 
titanium, united, (as isomorphous bodies are known to be,) in 
quantities which are not necessarily in the ratio of their equivalents. 
t will be seen that the numbers 3, 7, and 6 do not accurately ex- 
press the equivalents of their respective substances, but the ex- 
_ ess In one is precisely made up by the deficiency of another, so 
that the sum of their equivalents is just 16; or dividing all the 
numbers obtained by 8, it equals two equivalents. The formula 
derived. from this is, (Fe Ti Al)+Mg, Si+2H.. The small 
quantity of lime doubtless replaces a portion of the magnesia. 
The following result was obtained by calculating the quantity 
of two equivalents of the oxides mixed in the proportion in 
which sedis really occur. 
: Caleulated. Found. 
_ Siliciec acid, . 18-000 18.500 
Oxide of titanium, ) ia ) 
e of i iron, _ 51810 51-996 
na Nags 93415 «22-200 
~ Lime, BGO 1-300 
cay Water, 6-813 7.350 
101-138 101-346 
