pyritohedron


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Related to pyritohedron: Scalenohedron, rhombohedron

pyritohedron

[pə¦rīd·ō′hē·drən]
(crystallography)
A dodecahedral crystal with 12 irregular pentagonal faces; it is characteristic of pyrite. Also known as pentagonal dodecahedron; pyritoid; regular dodecahedron.
References in periodicals archive ?
The best crystals are pyritohedrons measuring 7 or 8 mm, found as floaters in a pale brown vein of carbonates.
From the Moon-lite claim, Bullion Canyon, Tooele County, groups of lustrous cubes and pyritohedrons, with individuals to 4 cm on edge, emerged during the 1980s and 1990s; from the Four Metals mine, also in Bullion Canyon, clusters of distorted pyrite cubes, individuals to 5 cm, on greenish clay matrix, emerged during the past few years.
These are groups of pyritohedrons, mirror bright, in miniature sizes--really superb.
Spruce Ridge pyrite crystallizes in cubes, pyritohedrons, and combinations thereof.
The hubnerite, in turn, forms thick growths, like a prickly underbrush, on slightly rough-faced pyrite pyritohedrons to 5 cm on edge, and groups of same to 15 cm across.
Good specimens of barite, enargite, octahedral pyrite, pyrite pyritohedrons, and good iridescent pyrite along with quartz crystals were collected.
In addit ion there were Scandinavian classics like loose, sharp 2-cm pyritohedrons of cobaltite and sharp, lustrous pseudo-octahedrons of glaucodot from Sweden; well crystallized leucophanite, columbite and thortveitite from Norway; and richly brownish red, euhedral crystals of eudialyte to 2 cm in complex ultra-alkaline matrix, not from the Kola Peninsula, Russia, but from 19th-century localities in Greenland.