262 ANALTS1S of a BLACK SAND 



pearance in it. By repeated evaporations, all the cryftals that 

 would form were feparated. They weighed 6 grains. I redif- 

 folved them in water, and added fome ammonia to the folu- 

 tion. A fine yellow powder fell, which I foon recognifed to 

 be oxide of uranium. It weighed 4.2 grains. 



7. Thus it appears, that the 52 grains (No. 4.), attracted by 

 the magnet, contained 46 grains of iron, and 6 grains of ura- 

 nium and titanium. 



8. The following are the fubftances feparated from 100 

 grains of iferine, by the preceding analyfis : 



Oxide of titanium, 54.8 



Oxide of iron, - 46.0 



Oxide of uranium, 4.2 



Silica, - - 16.8 



Alumina, - 3.2 



Total, 125.0 



Here is an excefs of no lefs than 25 grains, to be accounted for 

 by oxygen, which mull have united to the three metals during 

 the procefs. As to the iilica and alumina, there can be little 

 hefitation in afcribing them to grains of fand, which had been 

 mixed with the ore. The pure iferine, in all probability, was 

 compofed of iron, titanium, and uranium. If we fuppofe that 

 each of thefe metals exifted in the ftate of protoxide, we mult 

 diminifh the titanium by one-fourth, the iron by one-feventh 

 nearly, and the uranium, according to Bucholz's experiments, 

 by one-fifth. This would give us, 



Titanium, 



