332 Prof. Berzelius on some new localities of' rare Minerals. 



ed a precipitate with oxalate of ammonia, which became black in 

 a red heat, and was oxide of manganese mixed with a little lime. 



G. What had been precipitated by ammonia, was soluble 

 in muriatic acid, giving out a slight odour of chlorine, and 

 after being saturated with sulphate of potash, the solution 

 gave a lemon-yellow precipitate of sulphate of cerium and po- 

 tash, which was decomposed by caustic potash, and yielded 

 oxide of cerium. The remainder proved to be yttria, mixed 

 with a little oxide of manganese. 



In this manner, the following proportions among the ingre- 

 dients were obtained : 



Titanic acid, - - 46.3 



Zirconia, . - 14.14 



Oxide of iron, - - 12.20 



Lime, - 4.2 



Oxide of manganese, - - 2.7 



Oxide of cerium, - - 5.0 



Yttria, --'' - - - 11.5 



Total 96.3 



With traces of magnesia, potash, silica, and oxide of tin. 

 The loss is in reality greater than it appears in comparing the 

 numbers of the result, because the manganese and iron, and 

 probably also the cerium, exist in the mineral in the state of 

 protoxides. No calculation can, therefore, be grounded on 

 this analysis, only so much may be inferred, that the mineral is 

 a titanate of zirconia, mixed with other isoraorphous titanates. 



Art. XXV. — On some nezc Localities of rare Minerals* By 

 Professor J. J. Berzelics, M. D. F. R. S. Lond. and 

 Edin. &c. &c. 



Several remarkable minerals, the orthite, zircon, and soda- 

 spodumene, have been discovered in the island of Skepsholm 

 in Stockholm, during the blasting of some rocks upon it, in 

 the course of the summer of 1824. They do not occur in re- 

 gular veins, but are here and there disseminated through the 



* From the " Ansberaitche omframsfegen in Pht/sik oeh Chemic, 1825,' 

 p. 193 and 220- 



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