Malachite and Azurite are both simple Copper carbonates. Azurite occurs as a secondary mineral in the oxidized zones of copper deposits. Where as Malachite occurs as an alteration product in the oxidized zones of copper deposits. They are chemical twins. The only differences is that Azurite holds less water than Malachite. Azurite and Malachite are often mixed together and make great looking Specimens. Azurite & Malachite mineral specimen from the Jiangxi Province, near Dexing China. This is a very good specimen. The close up picture shows the nice sharp azurite crystals and chatoyant malachite.