Magnetite, hematite, and pyrite. Which one is not suitable for iron making? Why?
Although the iron content of limonite is lower than magnetite and hematite, but because of its loose, easy to smelting, it is also an important iron ore. The world's famous ore producing areas are France's Lorraine, Germany's Bavaria, Sweden and other places
The weathering products belonging to the iron minerals (Fe2O3 - nH2O), impure, content change of water is also great. Usually the yellow to brown streak of brown, black, semi metallic luster, massive, bell emulsion, grape like, porous or powder, often showed nodular or pyrite the crystal form of illusion. The hardness varies with mineral forms, no magnetism. Limonite is under oxidizing conditions extremely secondary general, in the oxidation zone of sulfide deposits often constitute the "red cap", can be used as a sign of prospecting.
Common iron ores are hematite (the main component is Fe2O3), magnetite (the main component Fe3O4), siderite (mainly FeCO3), pyrite (the main component is FeS2)
