139 



TAB. CCCLXXIV. 



FERRUM sulphureum. 

 Curving or Bending Pyrites* 



Div. 2. Imitative. 



Perhaps 1 could not show any thing more extraordinary 

 or, I believe, more rare in the system of Crystallization, than 

 the present specimen which I possess by favour of my 

 good friend Philip Rashleigh, Esq., of Menabilly, who 

 sent it to me in 1806, labelled from Carundale in Devon- 

 shire. 



Pyrites is well known to form the Cube and Octaedron, 

 with their modifications, very neatly : see labs. 29, 30, 

 99, &c, and to produce varieties from them, wedge-formed, 

 rounding, concave, and convex, cock's-comb-like, &c.$ 

 see tabs. 366 and 367 3 and to mix in somewhat cruciform 

 and other odd appearances. In the present instance the 

 Pyrites seems more like Sheet Metal cut into pieces, 

 as if with a pair of sheers, curving in various directions : 

 thus we have an appellation of " imitative " to recognise 

 it by j which is very convenient in the present instance. I 

 do not know that curved crystallization has been at all 

 mentioned by any author. I should suppose, however, that 

 it depends upon the same laws of aggregation in this sub- 

 stance as the straight or rounded ; see vol. ii. p. 57: and 

 the rounded figure in tab. 131. Its state while depositing 



