Tags: Chemical Substance, Mineral.
Gersdorffite is a nickel arsenic sulfide mineral with formula NiAsS. It crystallizes in the isometric system showing diploidal symmetry. It occurs as euhedral to massive opaque metallic grey-black to silver white forms. Gersdorffite belongs to a solid solution series with cobaltite CoAsS. Antimony freely substitutes also leading to ullmannite NiSbS.
