Mineral chemical inhomogeneity about its floatability, such as different colors of sphalerite (ZnS) which may float clear differences. The color of the sphalerite is related to the impurities contained therein, from light green, tan and dark brown to steel grey. Green, gray, and yellow-green are caused by ferrous ions; brown, tan, and yellow-brown are caused by the chromogenic properties of zinc ions themselves and the substitution of isomorphous tin ions; with iron ions in the sphalerite crystal lattice The increase, the color deepens, when the iron ion content is about 20% or 26%, such sphalerite turns black, called high-iron sphalerite. Impurities such as Fe, In, Ge, and Cd displace zinc in the zinc sulfide crystal lattice to form a heterogeneous or emulsion-like infiltrated body, and even form a solid solution. The mutual symbiosis of these components makes the floatability of sphalerite diversified.
Therefore, although sphalerite is a common mineral for flotation, it has not been determined so far.
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