Azurite
Azurite is a beautiful copper-based blue mineral that is often used in jewellery. The colour ranges from very deep blue to pale blue. Azurite has also been used as a dye for paints and luxury fabrics. Azurite is hydrated copper carbonate; its chemical formula is Cu3 (CO3)2(OH) 2. Malachite, another copper-based mineral, and azurite are often found together. Azurite is sometimes coated with a colourless wax or impregnated with plastic in order to enhance the colour and increase the hardness.
Azurite is found in massive monoclinic crystals in Australia the south-western USA, France, Mexico, Morocco, Namibia, Zaire, 
and Europe.
Azurite has a hardness of 3.5 to 4 (relatively soft) and a specific gravity of 3.7 to 3.9.
