TAB. CIV. 



FERRUM sulphureura. 

 Sulphur et of Iron. Iron Fyrites, 



Class 3 . Metals. Order 1 . Homogeneous. 



Gen. 7. Iron. Spec. 4. Sulphuret of. 



Div. 2. Imitative. 



Syn. Sulphuret of Iron of particular Shapes. Bab.204;. 



Sulphur and Iron in combination are very common, and 

 the forms of such compounds are extremely various, both 

 in regular crystallization and in the ruder states. The 

 specimen in the upper figure was given me by the Rev. Mr. 

 Charles Sutton, and it resembles such as have been formed 

 in chalk with an ochraceous outside. It has greatly the ap- 

 pearance of the fruit of the Plat anus Orientalis: the sur- 

 face, however, is crystallized, in quadrangular pyramids, or 

 half relieved octaedrons, with or without truncations. This 

 may convince the discerning that the form does not depend 

 on the fruit of the platanus, but is a form natural to itself, 

 and curious for its regularity of appearance. The forms of 

 the crystallization are magnified beneath, to show how 

 curiously they connive, sometimes giving a floriform appear- 

 ance. The next was found among the marly rocks at Sheppy 

 Island, and seems to have been of a thickish consistence 

 like treacle, dropping at intervals, and giving this singular 

 formation of an inverted cone. The next figure, resembling 



