Pyrite
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It has been observed that the pentagonal dodecahedron, [∞o2/2], π {201}, on pyrite may have but six of its twelve planes developed in such a manner a to produce an apparent rhombohedron.
Keywords
iron, crystal, crystals, crystallography, sulphur, sulfur, sulfide, sulphide, imperfections, imperfectionGalleries
CrystalsSource
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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