Research on Different Pyrites in Late Permian Coal of Sichuan P...答:Mg,Co,Ca etc. in coal-pyrite have a relation w ith susceptibility,w hile ore-pyrites,w hich are rich in As,have low magnetic property. ∑2 ( Mn, Co,Ni,Cr) elements,∑3 elements have a relation w ith susceptibility of pyrites. Apparently,the susceptibility of coal pyrites are all ...