236 



University of California. 



[Vol. 3. 



BUBRITE. 



Iii the year 1890 Darapsky* published an analysis of an 

 impure red sulphate, from Chili, which he named rubrite from 

 its color, and later, in 1898, t he gave another analysis under the 

 same name, although there is very little in common between the 

 two analyses, and his derived formulas were quite different. This 

 later analysis corresponds fairly well to that of palacheite, although 

 he makes the formula for his mineral Fe203.2Mg0.4S03+18H20. 

 From the size of his crystals it would seem as though something 

 more than the mere chemical composition could have been deter- 

 mined for his mineral. His description simply states that they 

 were bright-red, long, orthorhombic or monoclinic crystals. In 

 view of his meager description and the fact that palacheite bears 

 no resemblance to the original material to which the name rubrite 

 was given, the writer has no hesitancy in giving a name to the 

 Knoxville sulphate. 



*Neues Jahrbuch, Mm, 1890, L, 65. 

 tlbid, 1898, 1, 163. 



University of California, 

 April, 1903. 



