36 Professor Connell on Carbonate of Copper and Zinc. 



Professor Agassiz here took occasion to express his opi- 

 nion of the Expedition, and spoke of the results in the high- 

 est terms. He bore testimony to the beauty as well as ac- 

 curacy of the engravings, acknowledging that they were not 

 surpassed by any that had hitherto appeared in Europe. — 

 {American Journal of Science and Arts, Second Series, No. 

 13, January 1848, p. 41.) 



Notice of Carbonate of Copper and Zinc from Matlock. By 

 Professor A. Connell. Communicated by the Author. 



A pale-green mineral from Matlock, with a laminated 

 structure and pearly lustre, and disseminated in small por- 

 tions through the matrix, was some time ago put into my 

 hands by Mr Brook, to ascertain if it was a carbonate of 

 zinc and copper, and I accordingly found it to be so. I at- 

 tempted a quantitative analysis with 3-lG grains of the mine- 

 ral, and obtained by ordinary methods — 



102-7 



This result might correspond to an atom of dicarbonate 

 of copper and zinc combined with an atom of water, 



2{g;0|co« + HO 



which would give 27 "9 per cent, of carbonic acid and water ; 

 but the smallness of the quantity prevented the determina- 

 tion of the relative quantities of carbonic acid and water. 

 The mineral seems to be either identical with or nearly allied 

 to Aurichalcite. 



I at one tin:e thought I had got traces of a substance con- 

 tained in it which I could not identify with any known body ; 

 but Mr Tennant of King's College, London, having kindly 

 procured for me several specimens of the mineral from 

 Matlock, I was enabled to satisfy myself that no such body 



