The colour of copper sulphide is
 

Copper sulfide main mineral ores are Cu₂S and CuS. After purification or some chemical reaction  we can obtain black or gray color lumpes. 

CuS obtained as ppt. with H₂S is black .

$$\begin{gathered} {\mathrm{Cu}}^{+2}+ {\mathrm{H}}_2\mathrm{S} \to \mathrm{CuS} + 2{\mathrm{H}}^{+} \\ ( \mathrm{Black} ) \end{gathered}$$