11hedwil ((CHALCOPYRITE)), $5 MINIMUM BID, Sweetwater Mine, Viburnum Trend District, Reynolds County, Missouri, 3.5 x 3.5 x 2.5 cm, Miniature, Multitude of iridescent colors of blue, magenta, and golden Chalcopyrite crystals.
Azurite: Dense merged crystals of Azurite are found in copper-ore areas of USA, in Russia (Altai and Ural), Kazakhstan, Germany, Zaire (Africa) and Australia. Separate large crystals of this mineral are found more rarely. From the point of chemistry azurite is a copper carbonate. Its blue color is explained by iron compounds.