Boleite
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Boleite is a complex halide mineral with formula: KPb₂₆Ag₉Cu₂₄(OH)₄₈Cl₆₂. It was first described in 1891 as an oxychloride mineral. It is an isometric mineral which forms in deep-blue cubes. Wikipedia
Color: Deep Prussian blue to indigo
Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
Crystal habit: Cubic crystals
Crystal system: Isometric
Formula (repeating unit): KPb26Ag9Cu24(OH)48Cl62
Luster: Vitreous to pearly
Optical properties: Isotropic