Cumengeite crystals, a selection of specimens of this crystallized mineral species.
Cumengeite is a mineral, and here you’ll find a number of collector’s items presented with a description, one or more photos and sometimes a video.
These cumengéites are for sale.
It is an oxy-halide of copper, chemical formula Pb₂₁Cu₂₀Cl₄₂(OH)₄₀-6H₂O, tetragonal (quadratic) crystal system.