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3. Notice of two Ores of Copper, one of them a new Mineral. 

 By Professor Connell. 



The first of the two ores here described, found in Cornwall, is a 

 new combination of chloride of copper, sulphate of copper, and water. 

 It occurs in beautiful small deep blue acicular crystals, of high lus- 

 tre, grouped in bundles. The quantity was too small for a quanti- 

 tative analysis. 



The other is essentially a double carbonate of zinc and copper. 

 It is from Matlock. It is pale-green, with a laminated structure 

 and pearly lustre. In the qualitative examination of it, the author 

 observed indications of one, or even of more than one, metallic oxide, 

 which he could not identify satisfactorily with any known substance. 

 This oxide was found to adhere to the copper, when that metal was 

 precipitated by sulphuretted hydrogen. When the sulphuret was 

 dissolved in aqua regia, and precipitated at a boiling heat by potash, 

 the new oxide remained dissolved in the alkali, and the solution 

 yielded on evaporation a small quantity of a soluble salt of a beauti- 

 ful orange-yellow colour. The solution of this salt, when acidulated, 

 gave, with sulphuretted hydrogen, a red-brown precipitate, which, 

 when dry, was insoluble in muriatic acid, but soluble in aqua regia. 

 On comparison with other known oxides yielding yellow compounds 

 with bases, it appeared to differ from all ; but the author had so mi- 

 nute a quantity to operate on, that he cannot pronounce decidedly till 

 he has made further investigation. 



The analysis of 3*16 grains of the mineral gave for 100 parts, 



102-7 



This might give the formula, ( — i O ) C O^ + H 0, that is, 



1 atom of dicarbonate of copper aud zinc, combined with 1 atom of 

 water, which gives 27*9 per cent, of carbonic acid and water to- 

 gether ; but the smallness of the quantity analysed, prevented the 

 determination of the relative proportions of carbonic acid and water . 



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