274 Elements of Mineralogy. 



IQ. When this ore bears a ftaladlitical ap-? 



pearance, and is very white, it is called Jlos 



Jerri and eifen bluth : this affords 27 per cent. 



of reguline iron according to Mr. Rinman, 



and confecjuently 35 of the brown calx. 



SPECIES VI. 

 Magnetic Sand. 



IT, That of Virginia, whofe colour is 

 black, is of this fort j its fpecific gravity is 

 4,600, and it contains about I its weight of 

 iron ; but its compofition has not yet been 

 difcovered, 



SPECIES VII. 



fled Calx cf Iron indurated, and combined with 

 a lit tie Argill, and frequently with Manganefc* 



Hematites. Glafs kopf. 



12. It is generally of a red, yellow, purple, 

 or brown colour, of a metallic luftre, and 

 very hard, though feldom fo hard as to give 

 fire with fleel ; when fcratched, it {hews a 

 red trace ; it is not magnetic before torrefac- 

 tion, but by that heat it becomes black and 

 magnetic ; its ftru&ure is either folid, gra- 

 nular, fcaly, or fibrous; it occurs either in 



{hapelefs 



