Azurite on Malachite

Azurite is a deep blue copper mineral that normally forms the the weathering of copper deposits. It is generally found with its mineral cousin malachite which is why you can get both colors in one rock. Azurite is typically found as tabular to prismatic crystals of a deep "azure blue" color with splendent vitreous faces. Over 100 forms have been described. Azurite is often pseudomorphed to Malachite.