Scientific Name: Copper carbonate hydroxide
Chemical composition: Cu3(CO3)2(OH)2
Colors: Azure to dark blue.
Hardness: 3.5 to 4
Formation: Monoclinic crystals; Tabular, prismatic form
Principal Sources: Utah, Arizona, New Mexico, USA; France; Mexico; Chile; Namibia.
Special Notes: Mined in ancient Egypt as a source of copper and commonly used as a pigment and ceramic glaze.