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Covellite

Covellite is a rare copper sulfide mineral with the formula CuS. This indigo blue mineral is commonly a secondary mineral in limited abundance and although it is not an important ore of copper itself, it is well known to mineral collectors. Wikipedia
Cleavage: Perfect on
Color: Indigo-blue or darker, commonly highly iridescent, brass-yellow to deep red
Crystal class: Dihexagonal dipyramidal (6/mmm); H–M Symbol (6/m 2/m 2/m)
Crystal habit: Thin platy hexagonal crystals and rosettes also massive to granular
Crystal system: Hexagonal
IMA symbol: Cv
Luster: Submetallic, inclining to resinous to dull