3.5 - 4.0.
Nambia, Arizona, New Mexico, Mexico, Australia, China, France, Greece, Sardinia, Ural Mountains of Russia
Deep blue-black to brilliant blue azurite, combined with dark red cuprite, and occasionally green malachite and white calcite.
Like malachite, azurite-cuprite is occasionally coated with colorless wax, or rarely impregnated with plastic and/or other hardened agents to improve durabilty and appearance.
Bluebird is a member of the Azurite gemstone family.