This azurite is from the Daye or Tongshankou Copper Mine in the Huangshi Prefecture, Hubei Province, China. This is an iron and copper mine that contains over 25 types of minerals including azurite. It is a secondary mineral found in oxidied copper deposits. It is also a carbonate that contains the elements Cu, C, O and H. This is an outstanding plate like cluster of azurite crystals with attached and pseudomorphing malachite. They have a rich prussian-blue color and a vitreous luster that is accented by the malachite. This piece measures 2 5/8 x 2 x 1 3/4 inches or 67 x 50 x 45 mm.