Stereographic Projection of a Holosymmetric Rhombohedral Crystal

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“...in this figure the thicker lines are the projections of the three planes of symmetry, and on these lie the poles of the rhombehedra (six of which are indicated).” -The Encyclopedia Britannica 1910

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Crystals

Source

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

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