Question

what are the four main varieties of iron ore

Answer 1

The iron itself is usually found in the form of 

magnetite (Fe3O4), 
hematite (Fe2O3),
goethite, 
limonite or
 siderite. 


Hematite is also known as "natural ore".

The name refers to the early years of mining, when certain hematite ores contained 66% iron and could be fed directly into blast furnaces.

Answer 2

hamatine , magnetite ,titanomagnetite ,iron ore deposit s.