tetrahexahedron


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tetrahexahedron

[‚te·trə′hek·sə‚drän]
(crystallography)
A form of regular crystal system with four triangular isosceles faces on each side of a cube; there are altogether 24 congruent faces.
References in periodicals archive ?
Cubes and cubes with tetrahexahedron modifications are by far the two most common habits.
Tetrahexahedron faces, although sometimes smooth, more often show a variety of very interesting microscopic textures that lead to striations and frosted surfaces when such specimens are viewed with the naked eye.
Additionally, the hexoctahedron and tetrahexahedron forms, while rare in most areas, are quite common at the Mex-Tex.
These are superb octahedrons nicely modified by truncated edges and low-angle tetrahexahedron faces.
Minor modifications include the tetrahexahedron on the (100) face or beveled crystal edges.
On some crystals the dodecahedrons are modified by narrow faces of the {1211} trapezohedron, sometimes in combination with small faces of the cube {100}, or a tetrahexahedron.
The habit of some of the gold is dendritic to arborescent; some arborescent groups have rounded gold tetrahexahedrons to 2 mm resting on the tips of the "branches.
2 cm across), or as rough tetrahexahedrons as large as 1.
Delicate, acicular crystals are occasionally seen in cavities within massive quartz, associated with small botryoidal to hemispherical fluorite aggregates or crude fluorite tetrahexahedrons.
The crystalized copper occurs as rough tetrahexahedrons (M.