iron ore; rocks or minerals from which metallic iron can be extracted

pyrite; fool's gold; a common mineral with a metallic luster used as a source of sulfur

an iron oxide mineral that is black, heavy, and strongly magnetic; a primary source of iron ore

hematite; ferric oxide; a common iron mineral typically occurring as red-black crystals, masses, or plate-like structures

ilmenite; a titanium-iron oxide mineral that is the primary ore of titanium

mineral consisting of an oxide of chromium and iron, being the main ore of chromium

brown iron ore or limonite; a mineral that is an important source of iron which typically appears in brown, yellow-brown, or black lumps

siderite; a mineral composed of iron carbonate that often serves as a source of iron ore

A mineral consisting of iron and manganese tungstate, typically dark grey, reddish-brown, or black, and serving as a primary ore of tungsten

a hard iron arsenic sulfide mineral that serves as a primary ore of arsenic

A magnetic iron sulfide mineral often used in the manufacture of sulfuric acid

an iron manganese tungstate mineral that is the primary ore of tungsten

iron-bearing mineral sand used as a raw material for smelting iron

columbite; a black mineral that is an ore of niobium and tantalum

pentlandite; a mineral consisting of nickel and iron sulfide

A variety of hematite (Fe2O3) with a shiny metallic luster like a mirror, sometimes containing small amounts of titanium and magnesium; it is widely distributed and occurs in igneous rocks