OS.DEH VIII. UNCLEAVABLE CERIUM-ORE. 395 



Oxide of Cerium 68-69. 



Silica 18-00. , 



Oxide of Iron 2-00. 



Lime 1-25. 



Water and Carbonic Acid 9-60. 



Alone it is infusible before the blowpipe, but forms with 

 borax an orange-yellow globule, which becomes paler on cool- 

 ing. This rare mineral occurs in a bed in gneiss, at the 

 copper mine of Nya Bastnaes near Riddarhyttan in West- 

 manland in Sweden. It is accompanied by prismatic Bis- 

 nmth-glance, rhombohedral Talc-mica, &c. 



2. Among the minerals which accompany the uncleavable 

 Cerium-ore, there exists still another mineral belonging to 

 the order Ore, but which is too imperfectly known to 

 allow of being received in the system. It is the Cerine of 

 BERZELIUS (Cerium oxide sUiceux noir. HAUY. Traite*, 

 2de Ed. T. IV. p. 395.). Its forms seem to belong to the 

 prismatic system, its cleavage being pretty distinct in a 

 longitudinal direction. Its colour is brownish-black, streak 

 yellowish-grey inclining to brown ; hardness = 5-5 ... 6-0; 

 sp. gr. = 4-173. According to HISINGER, it consists of 



Silica 30-17, 



Alumina 11-31. 



Lime 9*12. 



Oxide of Cerium 28-19. 



Oxide of Iron 20-72. 



Copper (accidental) 0*87. 



Volatile ingredients 0-40. 



Before the blowpipe it froths and melts easily into an opake, 

 shining, black globule, which acts upon the magnetic needle. 

 Also with borax it melts easily, and forms a reddish- or yel- 

 lowish-brown ; with a small proportion of soda, a dark 

 greenish-grey globule. It agrees very nearly in several of 

 its properties with Allanitc. 



