Rockmagnetism is strongly correlated with the content of paramagnetic impurities (iron and manganese).
岩石的磁性与其顺磁杂质（铁和锰）的含量有关。
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However, it was William Gilbert (1544-1603) the physician to Queen Elizabeth I, who described this phenomenon as magnetism and the naturally-occurring rock possessing this phenomenon, as magnetite.
A study of magnetism of rock cuttings from 3 oil Wells in Liaohe Oilfield reveals that oil bearing formations in carbonate rock reservoirs are apt to be of lower magnetic susceptibility.