ORDER Vlll. OCTAHEDRAL COPPER-ORE. 381 



Brittle. Hardness = 40 . . . 4-5. Sp. Gr. = 5-432. 



Compound Varieties. Massive: composition gra- 

 nular, individuals strongly connected. 



OBSERVATIONS. 



1. According to an analysis by BRUCE, and another by 

 BERTHIER, the prismatic Zinc-ore consists of 



Oxide of Zinc 92-00 88-00. 



Oxide of Iron and Manganese 8-00 12-00. 



It becomes dull on being exposed to the air, and is covered 

 with a white coating. Alone it is infusible before the 

 blowpipe, but yields a yellow transparent glass with borax. 

 It is soluble without effervescence in nitric acid. 



2. It occurs massive, mixed with rbombohedral Lime- 

 haloide and dodecahedral Iron -ore, probably in beds, and 

 is found in large quantities in several localities in Sussex 

 county, New Jersey. It bids fair to become very useful in 

 extracting zinc. It is set free in several metallurgical pro- 

 cesses, and occurs crystallised in six-sided prisms of a yel- 

 low colour in the founderies of Kb'nigshutte in Silesia, ac- 

 cording to MlTSCHERLICH. 



GENUS III. COPPER-ORE. 

 1. OCTAHEDRAL COPPER-ORE. 



Octahedral Copper-Ore. JAM. Syst, Vol. III. p. 1 40. Oc- 

 tahedral Red Copper-Ore. Man. p. 236. lied Oxide 

 of Copper. Oxydulated Copper. PHILL. p. 306. Roth- 

 Kupfererz. Ziegelerz. WERN. Hoffm. H. B. III. 2. 

 S. 89. 98. Kupferroth. Kupferbraun. HAUSM. I. 

 S. 237- 240. Roth-Kupfererz. LEONH. S. 267- Cuivre 

 oxide rouge. HAUY. Traite, T. III. p. 555. Cuivre 

 oxidule'. Tabl. comp. p. 88. Traite', 2de Ed. T. III. 

 p. 462. 

 PHILLIPS. Trans. Geol. Soc. Vol. I. p. 23. 



Fundamental form. Hexahedron. Vol. I. Fig. 1. 

 Simple forms. H (/) ; 6 (P), Vol. I. Fig. 2. ; fo 



