44-6 PHYSIOGRAPHY. CLASS II. 



engaged in granular limestone. It occurs likewise in beds 

 in bituminous marl-slate at Camsdorf in Thuringia, and in 

 the county of Mansfeld, and in sandstone at Chessy near 

 Lyons. In veins it is met with in considerable quantities 

 in many of the mines near Iledruth in Cornwall, in small 

 quantities in several of the Shetland isles, and formerly in 

 the neighbourhood of Freiberg. Octahedral Copper is found 

 along with axotomous Triphane-spar in amygdaloid at Ober- 

 stein in the Palatinate and in Transylvania, and in a simi- 

 lar rock with rhombohedral Kouphone-spar in Nalsoe, one 

 of the Faroe islands ; in the last place in beautiful icositetra- 

 hedrons of the form Vol. I. Fig. 32. It occurs besides in many 

 localities of Germany, Spain, Norway, America, China, &c. 

 It is sometimes formed in the fissures of those rocks which 

 surround the repositories of various ores of Copper, as in 

 the vicinity of Moldawa in the Bannat. What has been 

 called copper of cementation^ is the metal precipitated from 

 its solution in sulphuric acid, by metallic iron. It is pro- 

 duced at Herrengrund and Schmolnitz in Hungary, and in 

 Cornwall. 



4. Copper allows of a very extensive and well known 

 employment in the arts and manufactures, as in roofing 

 houses, coppering ships, coining, and in the fabrication of 

 various utensils. The discovery of Sir HUMPHRY DAVY, 

 that copper may be guarded against the influence of sea- 

 water, by negatively electrifying its surface, will no doubt 

 enlarge its application in the coppering of vessels. 



ORDER X. PYRITES. 



GENUS I. NICKEL-PYRITES. 



1, PRISMATIC NICKEL-PYRITES. 



Prismatic Nickel-Pyrites. JAM. Syst. Vol. III. p. 266. 

 Man. p. 266. Copper Nickel. Arsenical Nickel. PHILL. 

 p. 283. Kupfernickel. WERN. Hoffm. H. B. IV. 1. 

 S. 164. Kupfernickel. HAUSM. I. S. 118. Arsenik- 

 Nickel. LEONH. S. 292. Nickel arsenical. HAUY. 



