trapezohedron

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trapezohedron

[trə¦pē·zō¦hē·drən]
(crystallography)
An isometric crystal form of 24 faces, each face of which is an irregular four-sided figure. Also known as icositetrahedron; leucitohedron; tetragonal trisoctahedron.
References in periodicals archive ?
At locality 44, pseudomorphs of albite after trapezohedral analcime crystals up to 1 cm were found in fine-grained, massive laumontite associated with meionite, titanite, fluorapatite and rare zircon.
Analcime has also been found in cavities in a dike in the alcove as hemispherical intergrowths of colorless trapezohedra, and as opaque white cubes modified by small trapezohedral faces, less than 1 mm in size.
In addition to the trapezohedral faces, there are also some faces of the rhombic dodecahedron {110} present: (110), (101), (011), (110), (101) and (011) that appear to form a second-order pseudohexagonal prism.
Sharp, gray to white, trapezohedral analcime crystals up to 4 cm are included in dark red villiaumite, associated with serandite and vuonnemite.
com) had a small handful of wondrously sharp, lustrous, dazzling trapezohedral crystals of almandine-spessartine newly taken from a pegmatite somewhere in the Shigar Valley.
In July 2001, a small pocket found at the bottom of the pit during mining produced some good specimens, including two miniatures with bright orange, trapezohedral grossular crystals to 2.
Garnet usually appears as very small trapezohedral crystals, with rounded faces of brown color, enclosed in actinolite.