Negative rhombohedron

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“The rhombohedron is a form consists of six rhombic-shaped faces, which correspond in their position to the alternate faces of a hexagonal pyramid of the first order. There may be two different orientations of rhombohedron. A negative rhombohedron is shown.” — Ford, 1912


William E. Ford Dana's Manual of Mineralogy (New York: John Wiley and Sons, Inc, 1912) 42


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