402 ON MINERAL VEINS. 



Sulphurets. 



Silver Zinc 



Copper ; yellow, gray Arsenic. Arsenic and Iron 



Lead. Lead and Antimony Antimony 5 red, and gray 

 Mercury j brown, red Bismuth. 



Iron. 



The minerals which seem to carry the evidence of 

 an aqueous origin in their forms, are the following. 



Earthy Phosphat of Iron Stalactitical Manganese oxyde, 



Stalactitical Haematites red and black 



Bog iron ore Stalactitical Calamine 



Iron stone Stalactitical pyrites, whether 



Malachite of iron or copper. 



The last list contains the minerals found in secondary 

 strata, of aqueous deposition, and which do not ap- 

 pear to have experienced the influence of fire. 



Gold Oxydulous iron 



Quicksilver Iron pyrites 



Muriat of quicksilver Hematites 



Sulphuret of quicksilver Iron stones and ochres 



Blue carbonat of copper Cobalt j black oxyde 



Green carbonat of copper Manganese 5 black oxyde. 



All of these are found in the preceding enumeration ; 

 so that these situations only offer proofs in confirma- 

 tion of the present views. 



I must now examine the minerals, whether earthy 

 or metallic, which are the produce of igneous fusion 

 or of sublimation from a state of vapour. The evi- 

 dences respecting these are also derived from two 

 sources ; from chemical experience, and from their 

 positions in rocks which are known to be the produce 

 of fire. These last may be limited to granite, the 

 porphyries and traps, and the volcanic rocks; though 

 there seems no reason to doubt that gneiss, micaceous 

 schist, and some other primary strata might be added 



