The ratio of magnesium to iron (m/f, m/f) is of great significance in the study of basic and ultrabasic rocks and ore-bearing properties. In 1959, Suo Polev (ндсоболеь) proposed to study the classification and ore-bearing property of basic rocks and ultrabasic rocks by the ratio of magnesium to iron. The formula is MF = n (MgO) n (FeO)+2n (Fe2O3)+n (MnO)+n (NiO), where n is the number of oxide molecules. When calculating M/F, magnesium and iron that constitute chromium spinel must be removed before calculation. Crystal chemistry theory shows that Mn2+ in fayalite-rich can be isomorphic to replace Fe2+, and Ni in forsterite-rich can be isomorphic to replace Mg2+. So it is more reasonable to put Ni in the molecule. When Wu Liren (1963) studied the metallogenic properties of basic and ultrabasic rocks in China, he put forward a slightly different formula of Mg-Fe ratio from Suo Polev, which was expressed by m/f to distinguish it from the former. MF = n (Mg2+)+n (Ni2+) n (Fe2+)+n (Fe3+)+n (Mn) where n is the ratio of atomic numbers. When there are many sulfides in the rock, Ni is not considered when calculating m/f. Generally speaking, the content of NiO in the rock is very small, so there is little difference between M/F ratio and M/F ratio.

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After years of geological work, I didn't find that useful. It is estimated that it can be used for academic writing papers.