54 



parallel to the primitive, in others vitreous. Perhaps one 

 of its characters may be taken from its odour, which is 

 similar to the smell of the place in which white lead is 

 prepared, with a peculiar pungency. It is easily reduced on 

 charcoal. — The forms are in general somewhat neat, and 

 the crystals are sometimes as clear as the finest glass; at 

 other times they are coloured with an oxide of Iron, from 

 a yellowish hue to a rusty brown. — They are brittle, and 

 soft enough to be scratched by Sulphate of Barytes, but not 

 Carbonate of Lime, and are mostly found on an ochraceous. 

 gangue. 



