Caledonite name derives from Caledonia, the historical name of Scotland, its place of discovery. It is a sulfate mineral of a blue- green color that can be found in the oxidized zones of copper -lead deposits. It is associated with other minerals such as linarite, cerussite, and malachite. The luster is high, the structure of the crystals is orthorhombic and the specimens are translucent to transparent. It has an important value for the collectors; a nice sized piece of Caledonite with crystals of 5 to 7mm can be purchased for $1350.