It used to be that there was a third thing associated with copper deposits. On the surface above the copper was semiprecious turquoise, and opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminum.
Yes, that’s part of the hydrothermal activity and oxidation above the porphyry in faults, seams and joints. Bisbee, AZ is the classic example. I think there is still some turquoise “mining” in that region.