Penetration Twin of Pyrite

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A penetration twin of two pentagonal dodecahedrons (known as the iron cross), whose twinning plane is the rhombic dodecahedron, is shown in this figure (Pyrite).

Galleries

Crystals

Source

George Huntington Williams, Ph.D. Elements of Crystallography for Students of Chemistry, Physics, and Mineralogy (New York, NY: Henry Holt and Company, 1892)

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