Colored By Copper: Blue and Green
These minerals come only in shades of blue or green. Why? They all contain copper. When atoms of copper combine with oxygen, as in the specimens here, the atoms absorb all colors from white light except blue and green—which reflect back to your eyes. Whether blue or green dominates in a mineral depends on how the copper atoms are placed in the structure.
Ancient Egyptians used malachite to make jewelry and eye shadow. Although relatively soft, it is an important ornamental stone nonetheless. The intricately patterned slab has been sliced and polished to a high gloss.