.^80 * 0LD MINES IN FRANCE. 



lie substances are found in it, such as sulphurct of lead, 

 phosphated lead, arseuiated lead, earthy oxide of lead, ar- 

 gentiferous gray copper ore, yellow pyntous copper, arsenia- 

 ted copper, green carbonate of copper, iron spar, sulpburejt 

 of iron, oxide of iron, acicular oxide of manganese, tellu- 

 rium, &c. These substauees are distinct, or combined two, 

 three, tour, or even live together. Frequently they contain 

 gold, and sometimes tins metal is apparent in them. 



State of the f^ e goW * s disseminated in the quartz of the vein. 



goMatGar- It is native and pure, or mixed, or alloyed with different 



Native pure, substances. It occurs without mixture in fpur different 

 forms. In octaedral crystals, adhering one to another so that 

 it is frequently difficult to ascertain their figure. 2. In rami- 

 fications, or dendr.ticaS, the most distinct specimens of which 



/ appear to consist of little or :aedva implanted one on another. 



3. Capillary slender filaments between the quartz crystals. 



4. Laminar, sometimes in flat, at others in twisted laminae, 

 the surface of whicn is occasionally reticulated, but more 

 frequently like shagreen. 



Mixed. Of the apparently native gold mixed with other metals 



there are three varieties. 1. Ramified or capillary in crys- 

 tals of sulphu etof had. On breaking these we percerve 

 ramifications and filaments of gold of a brilliant yellow co- 

 lour. 2. Granuiai in sulphuret of lead. 3. Native gold in 

 6ulphuret of zinc. 

 Gold alloyed The native gold alloyed with other metals, and concealed 

 wuh other ma- fry them, may be distinguished into eight varieties. 1. In a 

 mixture of lead, copper, and sulphuret of zinc. 2. In the 

 argentiferous gray conper ore with green carbonate of cop- 

 per. 3. In sulphuret of iron. 4. In the sulphurets of 

 zinc, lead, and copper, covered with arseniate of copper. 5. 

 With tellurium in needles. 6. In oxide of iron. 7. In 

 phosphate of lead. 8. In oxided manganese. 

 Oongues of The native gold is found likewise in five different earthy 



the native gangues. 1. In limpid hyaline quartz, or rock crystal. 2. 

 *° ' In smoky hyaline quartz. 3. In black hyaline quartz. 4. 



In hyaline quartz with sulphate of barytes. 5. In hyaline 

 quartz and carbonate of lime or calcareous spar. 

 Products of The workings of the gold vein of la Gardette have af- 



the gold mine, forded three different productions. 1. The gold which has 



been 



