TAB. LXVI. 



FERRUM oxygenizatum, var. crystallizatum. 

 Crystallized Oxide of Iron. 



Class 3. Metals. Order 1. Homogeneous. 

 Gen. 7. Iron. Spec. 3. Oxide of Iron. 



Div. 1. Crystallized. 



Gen. Char. Colour grey. Harder than most other 

 metals. Attractible by the magnet. Spec. Grav. 

 7. 2 ~- 7. 84. Kirw. Capable of combustion by 

 collision. Bab. Soluble in all the acids ; precipita- 

 ble from its solutions, the precipitate being of a 

 blue colour, by prussiate of potash. 



Spec. Char. In combination with above 24 per cent, 

 of oxygen. 



Syn. Specular iron ore. Kirw. v. 2. 162. 

 Fer oligiste. Haiiy, v. 4. 38. 



1 he peculiar form of this minute crystallization I could 

 not pass over, especially as it may be a very proper one in 

 arranging the varieties of the species to which it belongs. 

 The sort of iron ores from Lancashire, on which these crys- 

 tals are sometimes found, is not uncommon : there are also 



