Jl Description of a J^ew Mineral Species. 81 



the reducing flame ; more of the mineral fuses with the enamel into 

 a colorless transparent globule ; excess of soda does not render the 

 globule infusible, or indicate manganese. 



Borax dissolves its bulk of the mineral and gives a colorless glass, 

 which in the reducing flame, becomes more dense. If an equal bulk 

 of the mineral is added to the globule, it can be dissolved by long 

 exposure. 



By Phos. Ammo, and Soda, when the fragment is equal to the size of 

 the globule of salt, it is quickly penetrated and it then fuses and af- 

 fords an opaline globule j in the reducing flame the globule is trans- 

 parent whilst hot, and becomes translucent on cooling. By an inter- 

 mitting flame the globule becomes opake. 



Boracic acid, on charcoal, slowly dissolves the mineral; when the 

 colorless glass is in contact with metallic iron, no phosphuret is 

 formed j if oxide of iron is added, it renders the mixture more fusible, 

 but we cannot detect any phosphoric acid in this way. 



With nitrate of cobalt, there are the usual indications of alumina. 



The mineral in coarse powder was washed in pure water, dried at 

 60° F. reduced to a fine powder in a mortar of agate and the hygro- 

 metric water was removed by exposure to dry air at 100° to 120° F. 



J. Seven parts of the fine powder which had been cooled in a 

 desiccated atmosphere, were heated till red hot, the loss was .60 

 and the color became a shade darker=4.29 water on 50 parts. 



II. Fifty parts of the unheated mineral were mixed with strong 

 and pure muriatic acid, no gaseous matter escaped; the temperature 

 being about 80° F. decomposition had taken place after thirty six hours 

 had elapsed. The excess of acid was in part removed by dry air at 

 120° F. the mixture was then diluted with water and filtered through 

 a double prepared filter, the white powder which was left was care- 

 fully washed and ignited with the upper filter, cooled in a close vessel 

 of dry air, its weight was 24.68 ; ashes of lower filter .05 leaving 

 24.63. This powder readily dissolved in a warm diluted solution of 

 potash except .015 which was a light red powder, like that of the 

 associated mineral ; the alkaline solution was mixed with an excess 

 of muriatic acid and evaporated, a dry mass was left, this moistened 

 with strong muriatic acid, digested in water, the solution when clear 

 gave with ammonia an extremely light flock of silica. If from 

 24.63, we take .015 there remains 24.615 pure kilica. 



III. The fluid of II. was nearly neutralized by pure ammonia ; 

 warmed till air was expelled ; when cold, a slight excess of pure am- 

 VoL. XXV.-No. 1. 11 



