Chalcanthite

Chalcanthite – Cu(SO4)·5H2O
Elements: Copper, Sulfur, Oxygen, Hydrogen
Class: Sulfates
Crystal System: Triclinic
Hardness: 2.5
Calcite
Talc (1)Diamond (10)
Soft. A fingernail can scratch it.
Origin: Posey Mine, Red Canyon, San Juan Co., Utah – Usa