Boleite crystals, a selection of specimens of this crystallized mineral species. The box is a mineral, and here you’ll find numerous collector’s items presented with a description, one or more photos and sometimes a video. These boleites are for sale. It is a copper oxyhalide, with the chemical formula KPb₂₆Ag₉Cu₂₄Cl₆₂(OH)₄₈, of the cubic crystal system.