Rhombohedral system


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(Crystallog.) a division of the hexagonal system embracing the rhombohedron, scalenohedron, etc.

See also: Rhombohedral

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The X-ray powder diffraction lines of Mg-Al [(OH).sub.2]P[O.sub.4] (1) were preliminarily indexed in the rhombohedral system space group R-3c (167) with the unit cell data: a = b = 4.7602 and c = 12.9930 [Angstrom] (Ref.
Further XRD analysis predicts almost 79.93% corundum in sample C with closed pack rhombohedral system. Density and hardness of corundum are larger than that of the diaspore.
(2) In the rhombohedral system, the triply primitive hexagonal cell is used.