135 



TAB. CLXXI. 



FERRUM Sulpburetum. 

 Sulphur et of Iron, or Iron Pyrites, 



Div. 2. Imitative. 



.Minerals are necessarily lessons of the changes on the 

 terraqueous globe. The present specimen shows the cast 

 of an Anomia surrounded by Pyrites, and the place for- 

 merly occupied by the shell remains nearly empty. It is 

 extremely curious, that the Pyrites, in solution, should 

 have formed the cast and enclosed the whole, and by some 

 agent afterwards the shell should have been dissolved. 

 Lord Altamont's finding Gypsum enclosed in Pyrites (and 

 I have myself found it occasionally since) would, perhaps, 

 account for this, if we had found Gypsum in the place 

 where the shell had been, or near it ', for the sulphur in an 

 acidulous state might have combined with the lime. 



We are obliged to Mr. Weeks, of Hurst Pierpoint, for 

 this specimen, gathered by himself in that neighbourhood, 

 curious for many interesting fossil productions. 



