ANALYSIS OF A GRAY COPPER ORE. ^f 



ftll probability, was composed of iron, titanium, and 



uranium. If we suppose that each of these metals existed 



in the state of protoxide, we must diminish the titanium 



by one fourth, the iron by one seventh nearly, and the ' 



uraniivm, according to Bucholz's experiments, by one fifth* 



This would give us. 



Titanium, 41*1* 



Iron, 39*4 



Uranium, • •• 3*4 



Silica and alumina, •••• 20*0 



103-9 



Here, ,then, is still an excess of nearly 4 per cent. But this 



I am disposed to ascribe to the oxides of titanium and 



uranium having been only dried upon the steam bath. 



Upon the whole, it appears, that in the specimens of 



iserine analysed, the proportions of titanium and iron were 



nearly equal, and that the uranium did not exceed 4 per cent. 



The appearance of uranium surprised me a good deal. I 



perceive, however, that it has already been detected in this 



ore, from an analysis published by Professor Jameson, in 



the second volume of his Mineralogy, which, I understand, 



was made by Lampadius. The specimen examined by Component 



Lampadius yeilded very nearly CO parts of titanium, 30 P^'"'^' 



of ifon, and ten of uranium. Whereas, in mine, if the 



foreign matter be removed, there was obtained, very nearly, 



48 titanium, 

 48 iron, 

 4 uranium, 



100 

 j^ot there can be no doubt, that the iserine which I analysed 

 was still contaminated with a good deal of iron sand ; for it 

 was impossible to remove the whole. 



Analysis of a Gray Copper Ore, from Airthrey, 



The copper mine of Airthrey, near Stirling, consists of Topper mia« 

 a thin vein, which runs through the west corner of the °^ Airthiey. 

 Ochils. It has been twice wrought, by two different com- 



• Th s calculation supposes it in the state of deutoxide. ^sprotox-. 

 jtle it would not exceed 35'3. C. 



pahie;s^ 



