262 ANALYSIS of a BLACK SAND 
pearance init. 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. Tuus 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. Tue 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, - a2 
Total, 125.0 
Here is an excefs of no lefs than 25 grains, to be accounted for 
by oxygen, which muft have united to the three metals during 
the procefs. As to the filica 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 muft 
diminifh the titanium by one-fourth, the iron by one-feventh 
nearly, and the uranium, according to BucnoLz’s experiments, 
by one-fifth. This would give us, 
Titanium, 
