Description
Fine blue-green calumetite crystals associated with dendritic native copper, mineral from the Centennial mine in Calumet, Michigan, USA. The typical locality for calumetite is Calumet!
Calumenetite is a rare mineral. It was discovered in 1963 at the Centennial mine near Calumet, Michigan, USA. It is a halide with the chemical formula Cu (OH,Cl)2 2H2 O .
This post is also available in: French