396 ON MINERAL VEINS. 



rated by infiltration. Chalcedony is produced in the 

 latter way, quartz in both ; while the veins of quartz 

 and of carbonat of lime, are generated in this man- 

 ner. I have also already proved that the theory of 

 infiltration explains the imbedded nodules of the 

 amygdaloids ; and thus there is established a conside- 

 rable list of minerals formed by means of aqueous so- 

 lution. That which takes place in this case, may 

 equally happen in a mineral vein. 



Though we have not yet proved that all the other 

 earthy saline materials, such as gypsum and barytes, 

 are produced from watery solution, chemistry and 

 analogy both render it very probable ; and these may 

 therefore be added to the aqueous list, with little 

 hazard of error ; certainly with much less than they 

 could be referred to an igneous origin. Lastly, we 

 may possibly also refer to the same division, those 

 which are found associated or imbedded in quartz, 

 as disthene is ; though such cases as this are far more 

 questionable. 



The list constructed from these various kinds of 

 evidence will therefore contain the following minerals, 

 and possibly many more ; and it is here divided under 

 these several heads of more or less unexceptionable 

 proof. I do not add those which are imbedded in 

 primary limestone ; because it is more than probable, 

 that these have undergone the process of fusion ; in 

 which case their imbedded minerals must be referred? 

 as those of granite are, to an igneous origin. 



Saline Minerals. 



Carbonat of Lime Carbonat of Barytes 



Fluat of Lime Sulphat of Barytes 



Gypsum Carbonat of Stroritian 



Brown Spar Sulphat of Strontiau 



Arragoiiite Boracite 



Wavellite. 



