Sulphuret of Iron, or Iron Pyrites

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 formerly 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.