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CFUs are atomic assemblies which join with identical assemblies to form crystals. The structure of the diamond crystal requires a tetrahedral assembly of four C-atoms at each node of the structure determined by Bragg. The CFU for graphite is the same as the diamond CFU with one C-atom removed. Each C-atom provides a face of a regular tetrahedron. When these CFUs join, the join is similar to the join between two H-atoms that forms a He-atom.
The figure shows the CFUs of graphite and carbon. Each of the C-atoms has a different color. The yellow C-atom joins with the graphite CFU to form the diamond CFU.
There are three links below to download sites for files related to carbon and its crystals.
CARBON links to a page for downloading an excerpt from Octahedron1stEd.pdf.
CRYSTAL links to a menu of download pages relating to CFUs, phillipsite, staurolite, and crystals of silica.
OCTA links to the download site of the 500-page file Octahedron1stEd.pdf which relates the discovery of the octahedral periodicity of the Atomic Elements to their forms and how they join. For a very brief conceptual sketch of the book use the <Octahedron info> link at the top of the page.
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