172 



1VIENACCANITE. 



begins to evaporate. The whole may then be dissolved 

 by adding a sufficient quantity of water. 



92. MENACCANITE. (TITANIC IRON.*) 

 (Ti,Fe) 2 3 . 



For the analysis of this mineral, and for the pre- 

 paration of pure titanic acid, various methods are 

 employed. The iron dissolves in concentrated hydro- 

 Fig. 18. 



chloric acid but very slowly. When the levigated 

 powder is ignited in hydrogen-gas, the iron is reduced, 



* Titanic iron occurs in considerable quantity at Krageroe in 

 Norway, also in fine crystals in Orange Go., N. Y. Most varieties 

 contain magnesia and manganese. 



