- n. Plural form of tetrahedron.
“Lowell Gilbert @ 13, kid bitzer @ 15 -- Remember that the tetrahedral shape is that of the four bonds of the carbon atom; the implied tetrahedra are connected tip-to-tip, not solidly packed.”
“Five points form the vertices of two regular tetrahedra, joined on a common face situated in the horizontal plane.”
““Clay” as a mineral refers to a “cousin” of micas; that is, a silicate mineral containing structural sheets of silica tetrahedra tetrahedral arrangements of one Si and 4 Oxygen atoms, with the Oxygen atoms at the 4 corners.”
“Each of the 3 corners “shares” an oxygen atom with other tetrahedra, giving a ratio in the formula of 1 Si to 2.5 O, or Si2O5.”
“In sheet silicates, each silicate tetrahedron is joined at 3 corners to other tetrahedra in sheet form.”
“As with all silicate minerals, the basic building blocks of asbestos fibers are the silicate tetrahedra which may occur as double chains (Si4O11) -6, as in the amphiboles, or in sheets (Si4O10) -4, as in chrysotile.”
“The crystalline structure common to amphibole minerals consists of two ribbons of silicate tetrahedra placed back to back.”
“In the case of chrysotile, an octahedral brucite layer having the formula (Mg6O4 (OH) 4) -4 is intercalated between each silicate tetrahedra sheet.”
“Between craters the basalt was strewn in small tetrahedra, with angles rubbed and rounded, stone tight to stone like tesseract upon”
“There were even stranger shapes, exploiting almost every possibility of geometry - bizarre, translucent kites, tetrahedra, spheres, polyhedra, tangles of twisted ribbons ...”
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