APPENDIX. 319 



Before the blow-pipe, it emits a strong arsenical odor, and a globule of 



pure silver remains, surrounded by a slag. It consists, according to 

 KLAPROTH, of 



Silver 12-75 



Arsenic 35-00 



Iron - - - - - - 44-25 



Antimony ------- 4-00 



It occurs at Andreasberg in the Hartz, in Estremadura in Spain, and 

 at Kongsberg in Norway. 



ARSENIURET OF MANGANESE. 



Botiyoidal. Massive. Composition granular. Fracture uneven. 

 Color greyish- white. Sp. gr. ==5-55. 



1. In the air it becomes coated by a black powder. Before the blow- 

 pipe, it burns with a blue flame, attended by a white smoke, and the 

 odor of garlic. It is soluble in nitric acid. 

 2. Analysis. 

 By KASTE. 



Manganese 45-50 



Arsenic 51-80 



Oxide of iron 2-70 



3. It is found in Saxony. 



BERZELINE. 



In extremely minute white crystals. Lustre vitreous. Feebly trans- 

 lucent. Jt is fusible with difficulty into a pale glass, and gelatinizes 

 with heated acids. It appears to be anhydrous. 



Its locality is Galloro, near La Ricia in the Roman states, where it is 

 accompanied by black crystals of Garnet and pinchbeck Mica, in the dru- 

 sy cavities of an augite-rock. 



BlOTINE. 



Fracture vitreous to conchoidal. Lustre brilliant. Color white or 

 yellowish. Transparent. Presents double refraction. Hardness, 

 scratches glass. Sp. gr. = 3-11. 



It is not affected by the blow-pipe, and is only partly soluble in nitric 

 acid. 



It is found among the volcanic debris of Vesuvius. 



