288 Prof. J. Emerson-Reynolds on Lievrite. 



mass formed ; the product was evaporated to dryness, and the 

 silica separated in the usual way. The acid filtrate from the 

 insoluble silica was then saturated with chlorine gas, and am- 

 monia afterwards added in slight excess ; the mixture pro- 

 duced was then boiled in a closely covered beaker in order to 

 remove the excess of ammonia, the solution rapidly filtered, 

 and the precipitate collected and ignited with the usual pre- 

 cautions and weighed. The product contained all the iron 

 as ferric oxide, the alumina, the manganese as Mn 3 4 , and a 

 trace of silica. The silica was separated from this mixture by 

 hydrochloric acid ; and the filtrate was subjected to the double 

 treatment with pure caustic soda for the separation of alumina. 

 The iron and manganese were then separated by the baric- 

 carbonate method. From the weight of iron thus found, that 

 previously ascertained to be present in the ferrous state was 

 deducted ; the difference represented the weight of metal in 

 the ferric condition. The filtrate from the first precipitate 

 caused by ammonia had the calcium separated from it as oxa- 

 late ; and the latter was determined in the usual way ; the 

 filtrate from the calcium precipitate was then evaporated to 

 dryness and the residue heated to expel ammoniacal salts ; the 

 product of this treatment was dissolved with the aid of a few 

 drops of hydrochloric acid, the magnesium separated by means 

 of baric hydrate and estimated, while the alkalies in the filtrate 

 were converted into chlorides and weighed, and the potassium 

 separated by platinic chloride. No trace of lithium was de- 

 tected in the mineral. 



2'841 grms. of the freshly powdered and unaltered mineral 

 were heated gradually to redness in a hard glass tube connected 

 with a weighed chloride-of-calcium tube ; a current of dry air 

 was at the same time slowly drawn through the apparatus. 

 The water collected weighed -012 grm. ='422 per cent only. 



The percentage composition of the specimen analyzed by 

 Mr. Early may be thus stated, when the metallic and. other 

 components are calculated as oxides : — 



Si0 2 29-93 



FeO 31-83 



Fe 2 3 20-16 



MnO 3-02 



CaO 13-71 



MgO '30 



A1 2 3 *36 



K 2 -20 



Na 2 -29 



H 2 ;42 



100-22 



