BY ^y. F. PETTERD, C.M.Z.S. 47 



72. Chalcophanite (Hydrated Odides of Manganese and 



Zinc). 



Occurs in aggregates of small tabular rhombohedral 

 crystals, commonly in druses and botryoidal masses. A 

 usual habit is coating stalactitic iron-manganese, and often 

 covering comparatively large areas in the gossan zone of 

 the lode. At the Comet and other mines at Dundas it is 

 of the most intense black colour with a highly brilliant 

 lustre and velvety sheen. It is unquestionably one of the 

 most attractive species amid a large group of handsome 

 minerals. In the cabinet it rarely fails to attract atten- 

 tion, but from an economic standpoint it is valueless. 

 Although it was so extremely abundant at the locality 

 mentioned, it is in nature a mineral but rarely met with, 

 and then never so fine and attractive as it-s occurrence in 

 this S'tate. At the Magnet Mine it occurs as a blu^black 

 incrustation on psilomelane and other minerals. It some- 

 times coats the interior of small vughs, and occasionally 

 has isolated crystals of cerussite attached to it. At all 

 times it is interesting and attractive to lovers of the 

 beautiful in nature. 



73. Chalcedony. (See Quartz.) 



74. Chalcotrichite (Fihrous Cuprite). 



This beautiful variety of cuprite occurs m capillary tufts 

 of a bright crimson colour, usually surrounded by a thin 

 coating of native copper in small cavities in the limurite 

 rock of the Colebrook. North-East Dundas. 



75. Chiastolite (Silicate of Aluminium). 



This is often classed as a variety of andalusite, which 

 is of the same composition. The common form has been 

 obtained sparingly, as knotted masses penetrating slate 

 rock near its junction with the granite at Zeehan. 



7(). Chlorite (Hydrated Silicate of Aluminium and 

 Magnesium). 



In schist, and as beautiful bright-green fan-shaped 

 crystals in honeycombed quartz at Crown Lyell Mine. 

 Species undetermined. Occurs pseudomorphous after fel- 

 spar at Block 4891-93M, Ben Lomond (Waller, '' Report on 

 the Ben Lomond District," 1901). At the East Hercules, 



