PHYSIOGRAPHY. CLASS II. 



2. Pyramidal Copper-pyrites is equally frequent in beds 

 and veins. In beds it is accompanied by various ores of 

 iron and copper, by hexahedral Lead-glance, dodecahedral 

 Garnet-blende, several species of Augite-spar, &c. ; in veins 

 it is found along with a great variety of different species, 

 among which, besides the preceding ones, we notice several 

 ores of silver, as hexahedral Silver-glance, &c. It often occurs 

 accompanying pyramidal Tin-ore and prismatic Scheelium- 

 ore. The black friable substance called Copper-black, is the 

 product from the decomposition of pyramidal Copper-py- 

 rites, but also from that of several other species. If pure, 

 it is the peroxide of copper. 



3. Pyramidal Copper-pyrites is found in many countries. 

 It occurs in veins in Saxony, particularly in well defined 

 crystals in the mine of Kurprinz near Freiberg, also in 

 Anhalt, in the Hartz, and particularly in very large quan- 

 titic s in Cornwall. In beds it is found in the Bannat of 

 Temeswar, in the county of Gomb'r, and other districts in 

 Hungary, in Stiria, in Thuringia and Mansfeld, and pro- 

 bably also in Anglesea, where large quantities of it occur. 

 Much pyramidal Copper-pyrites is also met with in Nor- 

 way, Sweden, Siberia, &c. That from the Uammelsberg 

 near Goslar in the Hartz forms an intimate, and often 

 nearly impalpable mixture with hexahedral Lead-glance, 

 dodecahedral Garnet-blende, and hexahedral Iron-pyrites, 

 and occurs in the shape of a bed in grey wacke. 



4. Pyramidal Copper-pyrites is a very important mineral 

 for the production of Copper. It is also used for obtaining 

 blue vitriol or sulphate of copper. 



END OF THE SECOND VOLUME. 



OF THE 



UNIVERSITY 



