THE MINERALS OF NEW SOUTH WALES. 167 



It is found in most of the surface workings of New South 

 Wales copper mines, as in the Bathurst district with chlorite, 

 vitreous, yellow, and other copper ores ; at Cambalong earthy and 

 fibrous malachite is associated with barytes or heavy spar, and 

 with yellow and peacock ore; at Cobar, with steatite; Mitchell's 

 Creek, Wellington, mixed with other surface ores, and often con- 

 taining large quantities of gold and silver ; Reedy Creek, Icely, 

 Peelwood, Yass, Bingera, and other places. 



Chessylite. 



Azurite, or Blue carbonate of copper. 



Chem. comp. : Hydrous copper carbonate. 2 CuC0 3 + CuH 2 2 . 

 Copper oxide, 69*2; carbonic acid, 25*6; water, 5-2 = 100. 

 Oblique system. Colour from azure to indigo blue, translucent 

 to opaque. 



Found massive and crystallized. The best specimens of the latter 

 come from the Cobar Mines. They often assume a radiated concre- 

 tionary form, with the terminal planes of the crystals studding the 

 surface of the balls in the form of small projections. These con- 

 cretions vary from almost imperceptible points up to balls several 

 inches in diameter, and as they often occur diffused through a 

 pale grey or green coloured steatitic clay they present an extremely 

 pretty appearance ; at other times the crystals are set off by a 

 dazzling white felspathic clay. Well developed crystals are also 

 found lining vuggy cavities. 



At Cobar chessylite is associated with atacamite in addition to 

 the other more commonly occurring ores. 



At Woolgarloo chessylite occurs with native copper, cuprite, and 

 malachite in pink and white fluor spar. This mixture has at 

 times a very pretty effect, from the manner in which the copper 

 minerals are diffused through the cracks and reticulating cavities 

 in the fluor spar. Something of the same sort of thing is to be 

 seen in the fluor spar from South Wiseman's Creek. 



Amongst other localities for chessylite are Inverell, in quartz 

 veins ; Bathurst, Peelwood, Icely, and Ophir. 



Atacamite. 



Chem. composition : Hydrous oxychloride copper = 3 CuH 2 2 + 

 CuCl. Copper oxide, 53*6 ; copper chloride, 30 "2 ; water, 16*2 = 

 100. Rhombic system. Dark green in colour. 



Occurs in the Cobar and Cowra copper mines. 



Chryscolla. 



Chemical composition : Hydrous copper silicate = CuSi0 3 4- 

 2H 2 0. Copper oxide, 45-3; silica, 34-2; water, 20-5 = 100. 

 Amorphous. In colour, dark-green. 



Reported to occur in a matrix of semi-opal at the Coombing 

 Copper Mine, 2 miles from Carcoar. Also occurs at Cobar. 



