Brief description of three rare minerals, zavaritskite (BiOF), shafranovskite (K₂Na₃(Mn,Fe,Na)₄[Si₉(O,OH)₂₇](OH)₂-nH₂O,n≈2,33) and betekhtinite (Pb₂(Cu,Fe)₂₁S₁₅), are given. Digital models of their crystal forms and structures are simulated with application of the Shape v.7 and Atoms v.5 software packages. Basic structural patterns which may determine physical properties of the studied minerals have been revealed.