|Convoluted specimen with many irregular cavities lined with lustrous dark-blue azurite crystals to 1 mm in spherical aggregates to 10 mm diameter with fibrous green malachite crystals. Azurite crystals are visible on all sides.|
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. The green patina on weathered copper roofs is a form of Malachite. Both Malachite and Azurite are formed when carbon dioxide and water, weather copper ore or when copper ore weathers the mineral calcite. Azurite is found in shades of deep blue and is much more rare
Azurite and Malachite are very often found together. Blue bladed azurite crystals blending
with the rich green of malachite is a very pleasing mineral combination. A rarer Azurite
mixture, known as "Bluebird", is Azurite mixed with dark red Cuprite