It is a mineral with a blue glassy veneer. Must its name to that described for the first you see a piece found in 40 Linares; 41 Spain;. It is in essence a lead and copper sulfate, it is very little. It is associated with chalcopyrite.
LINARITE: Sulphate natural copper and lead, translucent, vitreous or diamantino brightness, dark bluish color and conchoidal fracture.