3.2" Botryoidal Chrysocolla and Malachite - Congo
Regularly, chrysocolla will form as botryoidal lumps and spheres, rarely forming visible crystals. It's also been known to form in both solid and fibrous veins, over fibrous minerals and in crusts. Known for its sharp and vibrant coloring, chrysocolla can display a wide variety of colors such as blueish-green, bright green, light blue to even sometimes multicolored specimens, depending on the atmosphere present during formation.
Malachite is a dark green, copper based mineral with the formula Cu2CO3(OH)2. It often forms botryoidal masses in fractures deep underground where the water table or hydrothermal fluids provide the means for chemical precipitation. It rarely forms crystals and it is often associated with another copper based mineral azurite. It was used as a mineral pigment in green paints from antiquity until about 1800.