Stone is the product of rock processing. Rock is composed of minerals, and iron-containing minerals are the source of iron in stone.
In the natural world, iron has a Clark value of 4.2% by weight, which is the fourth highest in the average chemical composition of the earth's crust. The content of iron is high, but it is rare in the form of pure metal natural iron. Because iron is easily oxidized, pure natural iron is rare.
Although iron is widely distributed in nature, it is mostly in the form of compounds. Because iron is a medium-active metal, it reacts strongly with oxygen, sulfur, chlorine and other elements at high temperatures, and is easily soluble in the solution of inorganic olefinic acid and concentrated hydrochloric acid, and the concentrated alkali solution is also easy to attack iron. Therefore, iron can only be preserved in nature in the form of a compound, that is, an iron-containing mineral.
The iron compounds are: oxides, sulfides, iron silicates, iron carbonates, iron phosphates, iron borate, iron sulfate, iron tungstate, iron molybdate, iron arsenate, iron arsenide, and the like. According to incomplete statistics, there are more than 100 kinds of iron-containing minerals mentioned above.
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