Serpierite

Serpierite (Ca(Cu,Zn)4(SO4)2(OH)6·3H2O) is a rare, sky-blue coloured hydrated, often found as a post-mining product. It is a member of the devilline group, which has members aldridgeite (Cd,Ca)(Cu,Zn)4(SO4)2(OH)6·3H2O, campigliaite Cu4Mn2+(SO4)2(OH)6·4H2O, devilline CaCu4(SO4)2(OH)6·3H2O, kobyashevite Cu5(SO4)2(OH)6·4H2O, lautenthalite of devilline. analogue of aldridgeite and it is dimorphous with orthoserpierite

It was discovered in 1881 and named by Alfred Des Cloizeaux in honour of Giovanni Battista Serpieri  [el. Serpieri was an Italian revolutionary, engineer and mining entrepreneur who developed mines in the Lavrion and founded the Montecatini Company. He was born in Italy in 1832 and died in Greece in 1897.