PHYSIOGRAPHY. 



Spodumene. 



205 



1. If exposed to the heat of the blow-pipe, it loses transparency and 

 color, intumesces, exfoliates and then melts into a nearly colorless 

 transparent glass. 



2. Analysis. 

 By ARFVEDSON. 



Silica . . 66-40 



Alumina . . 25-30 



Lithia . . 8-85 



Oxide of iron . . 1 45 



Oxide of manganese . 0-00 



By THOMSON. 



from Ireland. 



63-313 



28-508 



5604 



0-728 



0-828 



3. It occurs in primitive rocks, particularly in granite, associated with 

 Quartz, Mica, Albite and Tourmaline. 



4. It was first discovered at Uton in Sudermanlan, Sweden; but was 

 afterwards found also at Sterzing in the Tyrol, and Killiney in Ireland. 



It was first found in the United States, at Goshen, (Mass.) though 

 it passed for some time under the name of Augite. Two deposits of it 

 exist in that town, both of which are in granite ; at one of them, it is 

 associated with blue Tourmaline and Beryl. It exists also in the neigh- 

 boring town of Chesterfield, and at Sterling, in the same state. 



APPENDIX TO SPODUMENE. 



1. Killinite. The mineral described under this name, is found at Kil- 

 liney near Dublin in Ireland, associated with Spodumene, with which 

 it agrees in the cleavages, and from which it differs in hardness and sp. 

 gr. Its hardness = 4 00 and Sp. gr. =2-698. These differences how- 

 ever, appear to depend upon incipient decomposition. Before the blow- 

 pipe it becomes white, intumesces and melts into a white enamel. 



Jin a lysis. 

 By BARKER. 



Silica . . 5249 



Alumina . . 2450 



Potash . . 500 



Protoxide of iron . 2-49 

 Lime . . 000 



Magnesia with manganese 00 

 Protoxide of manganese 0-75 

 Water . . 5-00 



VOL. II. 18 



