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Nodular Malachite.

Malachite is a copper carbonate hydroxide mineral,with the formula Cu2CO3(OH)2. This opaque,green banded mineral

crystallizes in the monoclinic crystal system,and most often forms botryoidal,fibrous,or stalagamic 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 Pseudormorphs after more tabular or blocky arzurie crystals also occur. Typical Malachite is lamented. It can also appear with a rather bluish hue. ​