It has been found that there are >250 types of As bearing minerals in the environment (Rahaman et al., 2008). Arsenopyrite (FeAsS) is the most abundant As bearing mineral and other As bearing minerals such as niccolite (NiAs), enargite (Cu3AsS4), sperrylite (PtAs2), cobaltite (Co...
where each Ni is coordinated with six Cl, and each Cl forms coordination bonds with three Ni. In NiCl2, the Ni-Cl bonds have ionic characteristics. Yellow NiBr2 and black NiI2 also have similar structures, but due to the different filling modes of halogen atoms, these two...