Copper carbonate, Cu3(CO3)2(OH)2
Mineral data (Webmineral)
Azurite is characterized chiefly by its intense azure-blue color, vitreous luster and effervescence in hydrochloric acid. It is brittle and has a conchoidal fracture. It has a specific gravity of 3.7-3.8 and has a hardness of 3.5-4 in Moh’s Scale of Hardness. Azurite is named in allusion to its color. This ore mineral which measures 4.6 cm. in length, 3.9 cm. in width and 1.5 cm. in thickness.
Azurite is an ore of copper but not a common carbonate ore of copper compared with malachite, the green carbonate of copper, but has the same origin and association.
Azurite, the blue carbonate of copper, has a composition of Cu3 CO3)2 (OH)2 where 55.1 percent is copper. It is found associated with other oxidized copper minerals in the zone of weathering of copper lodes and deposits.
Its primary use (as an ore of copper) is in the electrical industry both as a conductor and for the electrical machinery. It is also extensively use in the manufacture of alloys. Copper salts are employed in various industrial processes – as disinfectant, chemical operations, printing, dyeing of textiles and as a fungicide. Azurite can also be cut and polished and used for orna-mental purposes.
The mineral is found in Zambales, Marinduque, Cebu, Negros Occidental, Negros Oriental, Nueva Vizcaya, Isabela and Mindoro. The specimen came from Sipalay, Negros Occidental. It was acquired by the National Museum as a donation from Maricalum Mining Corp. on March 18, 1996 having an accession no. NMM-632.