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iron ore

http://resource.geosciml.org/classifier/cgi/commodity-code/iron-ore

definition Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, deep purple, to rusty red. The iron itself is usually found in the form of magnetite (Fe3O4), hematite Fe2O3), goethite (FeO(OH)), limonite (FeO(OH).n(H2O)) or siderite (FeCO3). Ores carrying very high quantities of hematite or magnetite (greater than ~60% iron) are known as "natural ore" or "direct shipping ore", meaning they can be fed directly into iron-making blast furnaces. most reserves of such ore have now been depleted. Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel. 98% of the mined iron ore is used to make steel. more like this
narrower
http://resource.geosciml.org/classifier/cgi/commodity-code/hematite-ore original
broader iron-ore original
http://resource.geosciml.org/classifier/cgi/commodity-code/magnetite-ore original
broader iron-ore original
notation
01.01.02.02 more like this
FeOr more like this
source http://en.wikipedia.org/wiki/Iron_ore more like this
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Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/commodity-code/direct-shipping-ore original
narrower iron-ore original
in scheme commodity-code original
is primary topic of iron-ore