| http://www.w3.org/ns/prov#value | - As a result, clay is a major component of soil all over the world, with a variety of properties according to the precise conditions that applied during its formation.2Crystal structures Crystallographic studies have established that the clay minerals are composed of sheets of tetrahedral silicon dioxide (SiO2) and octahedral aluminium oxide (Al2O3) linked through bridging oxygen atoms.
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