Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Having eight plane surfaces.
from The Century Dictionary.
- Having eight equal surfaces or faces.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Having eight faces or sides; of, pertaining to, or formed in, octahedrons.
- adjective (Chem.) borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or
prismatic borax . - adjective (Min.) magnetite.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Having eight plane surfaces; thus, in the shape or form of an
octahedron . - adjective Of, or pertaining to
octahedra .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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I think aragonite, olivine and ice have hexagonal crystals whereas diamond has octahedral.
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Rutile is made up mostly of titanium dioxide with two rarer polymorphs anatase or octahedrite, which is a tetragonal mineral of pseudo-octahedral habit, and brookite, which is an orthorhombic mineral, the Doctor explained to her.
Update amberfocus 2008
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Ever. I slip my hands through the holes and into gloves, and pick up the biggest rock I see, a perfect 5-carat octahedral crystal three times older than the human species, formed during the age of the mastodons.
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With an arrangement of three orthogonal and three octahedral transducers, the complete stress state in a soil can be registered and principle stresses, normal and shear stresses and stress invariants can be calculated.
Soil compaction 2008
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Ever. I slip my hands through the holes and into gloves, and pick up the biggest rock I see, a perfect 5-carat octahedral crystal three times older than the human species, formed during the age of the mastodons.
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In the octahedral layer (brucite), magnesium can be substituted by several divalent ions, Fe+2, Mn +2, or Ni+2.
Geology of asbestos 2007
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In the case of chrysotile, an octahedral brucite layer having the formula (Mg6O4 (OH) 4) -4 is intercalated between each silicate tetrahedra sheet.
Geology of asbestos 2007
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How much does it derive from the gems 'brilliant sparkle, the product of an octahedral crystalline structure that reflects light in just the right way?
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The stacking of the tetrahedral and octahedral sheets in the chrysotile structure has been shown to yield three types of chrysotile fibers: clino-chrysotile: monoclinic stacking of the layers, x parallel to fiber axis, most abundant formortho-chrysotile: orthorhombic stacking of the layers, x parallel to fiber axispara-chrysotile: two layer structure, 180° rotation of two-layer structures, y parallel to fiber axis
Geology of asbestos 2007
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And that particular stone almost looks like the half of a diamond crystal, of an octahedral (ph) crystal.
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