Malachite

is a copper carbonate hydroxide mineral typically found as stalactites and botryoidal coatings on the surfaces of underground cavities. 

The mineral was given this name, of Greek origin, due to its resemblance to the leaves of the mallow plant.

When this material is cut into slabs and pieces, the cut surfaces often exhibit concentric banding. 

Even though turquoise is found around the world, the right type of minerals must be in just the right place for millions of years for it to be formed. 

Turquoise deposits usually form in iron-rich limonite or sandstone. Limonite creates dark brown markings in turquoise, while sandstone creates tan markings. These can resemble splotches or veins and are called matrix.