TAB. LIV. 



FERRU M suboxygenizatumu 



Magnetic Iron Ore. 



Class 3. Metals. Order I. Homogeneous. 

 Gen. 6. Iron, Spec. 2. Magnetic. 



Div. 1. Crystallized. 



Spec. Char. Iron in combination with but a small 



portion of oxygen *. 

 Syn. Iron in a calcined state mineralized by pure air. 

 Kiriv. 2. 157. 

 Magnetischer Eisenstein. Emmerl. 2. 278. 

 Fer oxydule. Haiti/ 4. p. 10. 

 Ferrum tesselare. Linn. ed. 12. t. 3. p. 136. 



I was much pleased when I discovered this curious crystal- 

 lization in a pyritaceous copper ore sent me, among other 

 favours, from the neighbourhood of Tavistock, by my kind 

 friend Mr. John Taylor junior. 



The crystals are dispersed through the ore in tolerable 

 abundance; but being small, do not readily distinguish 

 themselves to the unassisted eye : with a lens, however, 

 they are very satisfactorily seen, with the variety of modi- 

 fications here figured, and sometimes, by breaking them, 

 we find them curiously casing each other 2 or 3 times. 

 They are most readily attracted by the magnet, and will 

 support a part of the gangue of pyrites that may chance to 

 be attached to them, of 8 or 10 times their own bulk. The 

 gangue is said to be rich in copper, and is commonly of a 

 bright and pale golden colour, sometimes with a greenish 

 hue, and often iridescent. 



* 15 to 24 per cent. Kirw. vol. 2. 158. 



