Malachite (Botryoidal) with Chrysocolla, Congo.
7.5” x 2.5” x 4.5” / 3.50 lbs
This opaque, green banded (copper carbonate) mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and spaces, deep underground, where the water table and hydrothermal fluids provide the means for chemical precipitation. Individual crystals are rare but do occur as slender to acicular prisms.
NB: I will post more Malachite / Chrysocolla during the holiday season.