Octahedron with Furrow Edge

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The illustration “shows how the octahedron with furrowed edge may be constructed from two interpenetrating tetrahedra (shown in dotted lines).” -Britannica, 1910

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Crystals

Source

Encyclopaedia Britannica (11th ed., vol. 8) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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