Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A prism with six faces, each a rhombus.
from The Century Dictionary.
- noun In geometry and crystallography, a solid bounded by six rhombic planes.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Geom. & Crystallog.) A solid contained by six rhomboids; a parallelopiped.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
prism withsix faces , each arhombus .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
Etymologies
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Examples
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Its crystals have formed in a textbook rhodo shape--rhombohedron--very geometric, very distinct, with nice sharp, flat faces.
In Pictures: Highlights Of Marc Weill's Mineral Collection Missy Sullivan 2006
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Depending on the habits of the crystals, certain trivial names have been used, such, for example, as dog-tooth-spar for the crystals of scalenohedral habit, so common in the Derbyshire lead mines and limestone caverns; nail-head-spar for crystals terminated by the obtuse rhombohedron
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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The primitive rhombohedron, r {100} (fig. 1), is comparatively rare except in combination with other forms.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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Distinct crystals are somewhat rare; they have the form of the primitive rhombohedron (rr '= 72° 20'), the faces of which are generally curved and rough.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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A flatter rhombohedron, e {110}, is shown in fig. 2, and a more acute one, f {11-1}, in fig. 3.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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Owing to the strong double refraction and the consequent wide separation of the two polarized rays of light traversing the crystal, an object viewed through a cleavage rhombohedron of Iceland-spar is seen double, hence the name doubly-refracting spar.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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This lamellar twinning is of secondary origin; it may be readily produced artificially by pressure, for example, by pressing a knife into the edge of a cleavage rhombohedron.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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As in the other rhombohedral carbonates, the crystals possess perfect cleavages parallel to the faces of the rhombohedron.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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The crystal of prismatic habit shown in fig. 4 is a combination of the prism m {2-1-1} and the rhombohedron e {110}; fig. 5 is a combination of the scalenohedron v {20-1} and the rhombohedron
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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An important property of calcite is the great ease with which it may be cleaved in three directions; the three perfect cleavages are parallel to the faces of the primitive rhombohedron, and the angle between them was determined by W.H. Wollaston in 1812, with the aid of his newly invented reflective goniometer, to be 74° 55 '.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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