W. F. Hillebrand — Vanadium Sulphide, Patronite. 147 



already described. On burning it off there is left a straw- 

 colored residue in which nothing miheralogically definite was 

 recognized except a few quartz grains. It is not unlikely that 

 it consists chiefly of a clay-like substance and titanium dioxide 

 in an amorphous state. Some vanadium in an oxidized form, 

 perhaps a constituent of the clay, is also present. 



It thus appears that the sulphur and vanadium exist in four 

 different forms in the powdered ore. Mr. Hewitt states that 

 lead, zinc, copper, arsenic, antimony, calcium, magnesium, 

 silver, gold, and platinum were sought but not found. Uran- 

 ium and germanium were looked for in vain by myself. Prof. 

 B. B. Boltwood, who kindly examined for me both the vana- 

 dium ore and the quisqueite, reports hardly any evidence of 

 radio-activity. 



Bulk Analysis of the Ore. 



The results in the following analysis are not in all cases 

 highly accurate, and the summation is affected by indetermin- 

 able errors, among which is too high water, because some of it is 

 derived from the hydrogen of the carbonaceous matter. This 

 error is to a large extent offset by the oxygen of the carbona- 

 ceous matter. The vanadium sulphide constitutes about two- 

 thirds of the ore, the metallic sulphide over one-tenth. It is 

 not only an ore very rich in vanadium and from which the 

 latter can be very readily extracted, but it also carries a per- 

 centage of nickel that may prove commercially of much value, 

 since it will be left wholly in the residues after extraction of 

 the vanadium.* 



S (total) 58-79 (4-5 free) 



V " ' 19-53 



Mo 0-18 



Fe.._ 2-92 



Ni - 1-87 



C 3-47 



Si0 2 6-88 



TiO„ 1-53 



ALA(PA) - --- 2-00 



Fe 2 3 0-20 



MnO trace 



Cr trace? 



Alk 0-10? 



H 2 1-90 



O from V. sulphate 0-38 



99-75 



* Specimens received from Mr. Hewett since this paper was written 

 showed in some cases no visible metallic sulphide, in others but a few specks. 

 Tests were not made to ascertain if the amount actually present is less than 

 in the specimen first received. 



