Stone is a product of rock processing. Rocks are made up of various minerals, and among them, iron-containing minerals serve as the primary source of iron found in stone.
In nature, iron has a Clark value of 4.2% by weight, making it the fourth most abundant element in the Earth's crust. Despite its high concentration, pure metallic iron is rarely found in nature. This is because iron tends to oxidize easily, which makes naturally occurring pure iron very uncommon.
Although iron is widely distributed throughout the Earth, it mostly exists in the form of compounds rather than as a free metal. Being a moderately reactive metal, iron readily reacts with elements like oxygen, sulfur, and chlorine at high temperatures. It also dissolves easily in solutions of inorganic olefinic acids and concentrated hydrochloric acid, and even strong alkalis can attack it. As a result, iron is primarily preserved in nature as compounds—specifically, as iron-containing minerals.
Iron compounds include oxides, sulfides, silicates, carbonates, phosphates, borates, sulfates, tungstates, molybdates, arsenates, and arsenides, among others. According to incomplete records, there are over 100 different types of iron-bearing minerals identified so far. These minerals play a crucial role in the formation and composition of many natural stones and rocks.
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