Spinel-twin

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“An octahedron twinned on an octahedral face has the two portions symmetrical with repsect to a plane parallel to this face (the large triangular face in this figure).” -The Encyclopedia Britannica 1910

Keywords

octahedron, twin, spinel

Galleries

Octahedrons

Source

Encyclopaedia Britannica (11th ed., vol. 7) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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