rhombohedron


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rhombohedron

rhom·bo·he·dron

 (rŏm′bō-hē′drən)
n. pl. rhom·bo·he·drons or rhom·bo·he·dra (-drə)
A prism with six faces, each a rhombus.

rhombohedron

(ˌrɒmbəʊˈhiːdrən)
n, pl -drons or -dra (-drə)
(Mathematics) a six-sided prism whose sides are parallelograms
[C19: from rhombus + -hedron]

rhom•bo•he•dron

(ˌrɒm bəˈhi drən)

n., pl. -drons, -dra (-drə).
a solid bounded by six rhombic planes.
[1830–40; < Greek rhómbo(s) rhombus + -hedron]
rhom`bo•he′dral, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rhombohedron - a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)rhombohedron - a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
parallelepiped, parallelepipedon, parallelopiped, parallelopipedon - a prism whose bases are parallelograms
hexahedron - any polyhedron having six plane faces
References in periodicals archive ?
The calcite chips were obtained by gently striking a large calcite rhombohedron ([tilde]4 cm in length; Watkins Mineral Corp.
X-ray crystallography showed, however, that the basic unit of solid cubane is again a rhombohedron.
Carefully detailed crystallographic study reveals that in every case what appears to be a "single" crystal, resembling a distorted rhombohedron, is actually an oriented intergrowth of several parallel twins having a common composition plane.
Calcite crystals occur in a wide variety of habits, the scalenohedron and rhombohedron being the most common forms.
The stout amethyst crystals (terminal rhombohedron faces dominating) are medium-lustrous and color-zoned, with the best, gemmiest purple tones near their tips.
Crystal habits range from elongated hexagonal prisms with low-angle rhombohedron terminations to prism and scalenohedron combinations in varying proportions.
It occurs in a wide variety of habits, but the scalenohedron and rhombohedron are the most common forms.
Not only could Hauy cleave a calcite scalenohedron down until the rhombohedron emerged, but he could also derive the scalenohedral shape by stacking up tiny rhombohedrons in parallel (Hauy, 1801).
And then there was the very pleasant surprise of seeing large, beautiful, newly collected quartz crystal clusters containing baby-blue clouds and puffballs of ajoite under the terminal rhombohedron faces, these having been found 3 meters or so below the surface in one of the mines of the famous Messina district, Limpopo (formerly Transvaal), South Africa.