242 



704. ELECTRIC CALAMINE. (Silicate of Zinc.) 



a. Massive. 



Note. Electric calamine consists almost entirely of silicate of zinc. 

 See Dana, Mineralogy, p. 408. 



705. BLENDE. (Sphalerite, Black Jack, SulpJiuret of Zinc.) 



a. Crystalline, containing iron. (Marmatite.) 



b. Ditto. (Phosphorescent Blende.) 



Note. The black colour of this mineral is due to sulphuret of iron. 

 See Dana, Mineralogy, p. 48. 



CADMIUM. 



706. CADMIUM BLENDE. (GreenocJcite, Sulphuret of Cadmium.) 



a. Crystallized. 

 Note. For fig. of crystals, see-Daraa, Mineralogy, p. 59. 



COPPEE. 



707. NATIVE COPPER. 



a. Massive, from South Australia. 



708. AZURITE. (Blue Carbonate of Copper, Blue Malachite, Azure 



Copper Ore, Chessij Copper, Chessylite.) 



Note. This mineral is distinguished from the phosphate of copper 

 (Azurite of Jamieson) by having a blue streak, that of the phosphate 

 being white. See Dana, Mineralogy, p. '572. 



709. MALACHITE. (Green Carbonate of Copper, Green Malachite.) 



a. Massive, cut and polished. 

 Note. For varieties, see Dana, Mineralogy, p. 713. 



710. CUPRITE. (Ruby Copper Ore, Octahedral Copper Ore.) 



a. Crystallized. 



Note. This mineral consists almost entirely of cuprous oxide ; traces 

 of selenium sometimes occur in it. Dana, Mineralogy, p. 133. 



711. BORNITE. (Purple Copper Ore, Variegated Copper Ore, Peacock 



Copper Ore.) 



a. Massive. 



Note. This mineral is usually variegated with purple and copper-red 

 and yellow. It contains sulphide of copper, with some sulphide of iron. 

 See Dana, Mineralogy, p. 44. 



712. TOWANITE. (Chalcopyrite, Yellow Copper Ore, Copper Pyrites.) 



a. Massive. 



Note. Towanite contains less copper than Bornite and has a less 

 specific gravity. It is also a mixture of the sulphides of copper and 

 iron. See Dana, Mineralogy, p. 65. 



713. CHALCOCITE. (Copper Glance, Vitreous Copper, Redruthite, Sul- 



phide of Copper.) 



a. Crystallized, from Cornwall. 



