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On Sulphato- Chloride of Copper, a new Mineral. By ARTHUR 

 CONNELL, Esq., Professor of Chemistry in the University 

 of St Andrews.* Communicated by the Author. 



Some minerals were lately put into my hands by Mr 

 Brooke for chemical examination. Amongst these was one 

 which, on examination, I found to be a new combination, viz., 

 a sulphato-chloride of copper. 



This mineral occurs in small but very beautiful fibrous 

 crystals of a fine blue colour, which is pale when the fibres 

 are delicate, but much deeper when they become somewhat 

 thicker. Their form, Mr Brooke informs me, is a hexagonal 

 prism with the edges replaced, thus belonging to the rhom- 

 bohedral system. They possess considerable translucency, 

 and have a vitreous lustre. The crystals are too small, and 

 the quantity of them at my command too inconsiderable, to 

 enable me to state their specific gravity, hardness, or frac- 

 ture. Their locality is Cornwall ; but I do not know what 

 part of that county. Mr Brooke is aware of the existence 

 of only a very few specimens of the mineral. One is in the 

 British Museum. 



Like Atacamite, this mineral colours the blow-pipe flame 

 as well as the simple flame of a candle, a fine greenish blue, 

 indicating the presence of chloride of copper. Reduced to 

 powder, and mixed, in sufficient quantity, with charcoal 

 powder, and then heated in the close tube, it gives decided, 

 although not strongly marked, indications of the presence of 

 sulphuric acid by the smell, and partial bleaching of brazil- 

 wood paper, the remainder of the paper being reddened, 

 doubtless by muriatic vapours. Alone, in the close tube, it 

 yields a little water, and other appearances resembling those 

 afforded by Atacamite. Heated alone on charcoal before the 

 blow-pipe, it decrepitates strongly, but when previously de- 

 prived of the greater part of its water by gentle heat, and 

 then powdered, and moistened, and heated on charcoal, it 



* Read to the Chemicid 3ectloii of the British Association at Oxford, in June 

 1847. 



