1865.] Mining, Mineralogy, and Metallurgy. 487 



the gold rocks of North Wales, and the processes which have been 

 used, at home and abroad, for the separation of the gold. 



The following statement has been handed to us. It shows the 

 total quantity of gold obtained from the neighbourhood of Dolgelley 

 up to the end of 1864 : — 





Oz. 



Dwts 



Grs 



Old Dolfrwynog . 



117 



5 



5 



Prince of Wales . 



63 











Cwmheisian «... 



176 











Gwynfynydd .... 



6 



2 



3 



Welsh Gold Company . 



478 



17 



23 



Castell Cam Dochan . 



183 



15 



3 



Vigra and Clogau 



. 10,778 











Total 



. 11,802 







10 



Mineralogy. 









M. Haidinger* has called attention to some very curious stalac- 

 tites of green carbonate of copper found in a mine which has been 

 long abandoned at Eeichenau, in Austria. The mine had been 

 originally worked for carbonate of iron, and iron and copper pyrites. 

 These stalactites had resulted from the decomposition of the pyritic 

 ores. M. Haidinger supposes that the carbonate of copper had been 

 precipitated in a pulverulent state, carried forward by water, and 

 slowly consolidated under the influence of crystallization. Many of 

 these crystals present a rough and black surface, which appears to be 

 black oxide of copper. A series of curious metamorphoses have 

 evidently been going on between the formation of sulphate of copper, 

 by the decomposition of the sulphides of iron and copper, and the 

 formation of the carbonates and black oxides. 



A mountain of iron, rivalling, says the Abbe Moigno, " celles si 

 fameuses de Marquette," has been discovered upon the borders of 

 Lake Superior. A certain quantity of this iron ore taken from a depth 

 of about sixteen feet from the surface, and smelted in an ordinary 

 furnace, has given 60 per cent of iron, which is nearly equal to our 

 finest red h8ematites.'f• 



M. Kuhlmann is continuing his important inquiry on crys- 

 tallogenic force. He has recently communicated to the Academy 

 the fourth part of his memoir on this subject. It is not possible to 

 present an abstract which would convey any satisfactory idea of the 

 principles involved in the consideration of this subject. We must 

 refer our readers to the original memoir. J 



M. Henri St. Claire Deville has communicated to the Academy of 

 Sciences two notes by M. Felix Pisani. The first is on Kalicine, a new 

 mineral species from Chypis, in Valais ; and the second on the 

 Pisolitic Limonite, of Iwaro, upon the Lake CEdenburg, in Hungary. 



Kalicine was discovered in the fine collection of M. Adams, under 

 the name of carbonate of potash, and proved by analysis to be identical 



* Institut Imperial de Ge'ologie, Seance du 20 De'cembre, 1864. 



f ' Les Mondes,' 12 livraisons, p. 502. 



% See 'Comptes Rendus' and ' L'Institut,' May 17, 1865. 



