Tetrahedrite (I-43m)

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The crystal structure of the mineral tetrahedrite is a highly complex and intricate arrangement of atoms. The mineral is composed of five different elements - copper, antimony, sulfur, iron, and zinc - which are arranged in a repeating pattern of tetrahedral units. Each tetrahedron is formed by four atoms, three of which are sulfide ions and one which is an arsenide ion, with the copper atom at its center. The tetrahedrons are then linked together through shared edges to form a larger crystal lattice structure. This unique arrangement of atoms gives tetrahedrite its characteristic properties, including its distinctive color and density.