Before there were synthetic pigments, there were rocks.
Azurite was ground into blue paint and malachite into green, and both were in use for thousands of years. Malachite was ground for eye paint in ancient Egypt. A painter wanting these colours had to buy stone, crush it, and wash the powder.
That is the whole reason these minerals mattered historically. Not rarity, not beauty on their own, but the fact that a durable strong colour was extremely hard to get hold of, and here were two of them sitting in the same rock.
Do not grind or apply this. Copper carbonates are toxic if swallowed or inhaled as dust, and what the Egyptians put near their eyes is not something to repeat. Dust rather than wash, keep it away from children and pets, and wash your hands after handling. Azurite also alters to malachite in heat or damp, so keep it somewhere dry and stable and out of direct sun.
Mineral: Azurite (Cu₃(CO₃)₂(OH)₂) with malachite (Cu₂(CO₃)(OH)₂), both copper carbonates
Crystal system: Both monoclinic
Origin: Morocco
Hardness: 3.5 to 4 on the Mohs scale for both; soft and brittle, handle by the matrix
Treatment: None
Dimensions: 3.12 x 2.02 x 4.22 cm
Weight: 27.74 g
You will receive the exact piece photographed.