BY DR. STUART MILLS & PAM FREEMAN

Getty Images/Igor Golovniov/Eyeem; Getty Images/Jesper Klausen_science Photo Library

What is Azurite?

Azurite is a copper carbonate mineral with the chemical formula Cu3(CO3)2(OH)2. Renowned for its vivid deep blue color, azurite derives its name from the Persian word lazhward, meaning “blue.” The intensity of its color and relative abundance make it a popular choice for collectors and lapidaries alike.

How is Azurite Formed?

Azurite forms in the oxidation zones of copper ore deposits when water containing carbon dioxide reacts with copper-rich minerals. This creates a secondary mineral layer that includes azurite and often its green cousin, malachite. Azurite is also one of the minerals mined to make copper metal. The two frequently occur together, as malachite forms when azurite undergoes further oxidation. It typically forms monoclinic crystals or massive, botryoidal aggregates.