These quartz crystals from Cumberland appear to possess normal hexagonal symmetry. |
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Pezzottaite is trigonal, whereas the other members of the beryl group are hexagonal. |
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These are, in order of decreasing symmetry, the cubic, hexagonal, tetragonal, trigonal, orthorhombic, monoclinic, and triclinic systems. |
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For the first time, the coordination geometries hexagonal planar and trigonally monocapped trigonal-prismatic are seen. |
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It generally occurs as euhedral-subhedral hexagonal books, which commonly display a mottled green-brown pleochroic appearance. |
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These properties contribute to curvature stress that promotes hexagonal phase formation and membrane trafficking through vesiculation and fusion. |
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They are often elliptical in shape, but sometimes possess hexagonal outlines. |
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Note that the separate wrench on the small vise is hexagonal and fitted onto a hexagonal nut for tightening the vice. |
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The hexagonal pattern at the center of the image is likely to be associated with the hexagonal packing configuration of lipid molecules. |
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Carbon atoms are linked into hexagons, and the hexagonal pattern makes up the walls of a cylinder only nanometers wide. |
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The project leader says hexagonal pixels give smoother edges in images than square pixels. |
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Over the banister, visitors saw the top of an elegant structure, narrow at the base, with an inner hexagonal column. |
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There are over a dozen pen-and-wash studies of figures in oval or hexagonal frames. |
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After ripping out red linoleum, they finished the room with black-and-white hexagonal floor tile. |
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Cystine crystals are clear, colorless hexagonal plates, often appearing in layers. |
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Each molecule has on average six neighbors, generating a six-fold hexagonal symmetry. |
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This extension of the sun dogs is reflection from the vertical sides of the flat hexagonal ice crystals. |
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New taxa include branching forms up to 1 cm in diameter that display hexagonal symmetry. |
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Certain corals, for example, build structures with hexagonal symmetry, but not in seafloor sediment. |
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At temperatures below 417 degrees Celsius cobalt exhibits a hexagonal close-packed structure. |
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Ring compounds most often contain five or six atoms to form pentagonal or hexagonal structures. |
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Examples of less ambitious fortifications abound, like the concrete pillboxes, often hexagonal, which dot southern England. |
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Construction is geodesic, with a steel exo-skeleton of hexagonal grid of tubular compression members joined by standard cast connections. |
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It has a gargoyled, hexagonal bell-tower, and was started in the 13th century, and rebuilt in the 16th. |
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Examples of IVA tools are various sizes of wrenches and sockets, hexagonal, Phillips, and torque head drivers, pliers, and ratchets. |
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Assuming aggregation happens on the cell surface, we choose a two-dimensional hexagonal lattice. |
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The patented delay line detector features three pairs of low resistance wires wound around a hexagonal support. |
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The Drosophila compound eye contains around 800 individual ommatidia, arranged in a regular hexagonal pattern. |
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The hexagonal belfry contains six louvers with pointed arches and is crowned by an octagonal lantern and a copper dome. |
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Sunshine fell through the plastic windows of the hexagonal room and landed on containers of earth now devoid of the necessity for protection. |
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The others in the group generally lend their ears, some slurping steaming hot tea from squat hexagonal glasses. |
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Many conclude that because pyrite is cubic, pyrrhotite must be hexagonal, as it often appears. |
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Whereas monoclinic pyrrhotite is ferrimagnetic, the hexagonal variety is antiferromagnetic. |
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The beryl inclusions occur as acicular to hairlike crystals of aquamarine, pale bluish-green in color and clearly hexagonal in cross section. |
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The crystals that are being replaced are flat, tabular, and hexagonal in outline but are now composed entirely of iron hydroxides. |
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They usually involve three numbers or, in the case of hexagonal and rhombohedral symmetries, four numbers, one for each crystallographic axis. |
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The fruit is elongated, its green skin fissured by the hexagonal boundaries of the sections and covered with spikes. |
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We have also seen several specimens in which pyrite has replaced a hexagonal mineral that was probably pyrrhotite. |
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By contrast, the central region of Macrobdella Hb contains a hexagonal toroid at a resolution of 4 nm. |
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By the 1760s they had acquired lids and the oval gave way to square, octagonal, and hexagonal shapes as the century progressed. |
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Their molds demonstrate that lenses were numerous, biconvex, hexagonal in outline and arranged in an hexagonal close-packing system. |
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Rhodochrosite crystallizes in the trigonal class of the hexagonal system and occurs in a number of diverse forms. |
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The inner core is pure iron in a hexagonal close-packed crystalline form. |
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Pure phase zirconium exists in a hexagonal close-packed crystal structure. |
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The most famous is buckminsterfullerene, discovered in 1985, which is made up of 60 carbon atoms arranged in 12 pentagonal rings and 20 hexagonal rings. |
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We applied a swelling method to help determine the relative phases of the diffraction peaks along the crystal axis perpendicular to the hexagonal base. |
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The reduction of the longitudinal length could explain the developable surface but would not be compatible with the hexagonal packing of the columns. |
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The protein units appear to be packed in a compact hexagonal way and from the position and distribution of the spots it is possible to derive some structural parameters. |
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These cylinders, measuring but a nanometer or so in diameter, display a surface of hexagonal carbon rings that give the material the appearance of a honeycomb or chicken wire. |
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In principle, it is possible that the hexagonal symmetry of the inner structure is a result of superposition of stacks of membranes oriented at different angles. |
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In contrast to polyomaviruses, which by electron microscopy are round, the adenoviral particles are hexagonal and are twice as large as the polyomavirus. |
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The most distinctive item in the collection is the hexagonal vase. |
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It also features a new black-and-white, hexagonal cabinet, with a door that allows easy storage and comes complete with castors for easy movement. |
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The simian immunodeficiency virus destabilizes lamellar and promotes hexagonal phase, leading to the speculation that it has an effective negative intrinsic curvature. |
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Blue hexagonal beryl crystals and colorless, pale green, or blue topaz are found in cavities associated with microcline, smoky quartz, tourmaline, and, rarely, fluorite. |
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The structural preference of lipid mixtures for the lamellar or hexagonal phase is dictated by the minimization of molecular free energies of the component molecules. |
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The hexagonal design motifs seen around the exterior are featured extensively in the carbon-fibre and leather accoutred interiors. |
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Yet the perfect hexagonal bipyramids still in the test-tube must have had an internal order to produce those shapes. |
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A dihexagonal pyramid is composed of two hexagonal pyramids placed base to base. |
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Chesnokov et al. also reported from the same locality dmisteinbergite, a natural hexagonal polymorph of anorthite. |
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The 1993 excavations revealed that the new western apse was polygonal, and flanked by hexagonal towers, forming a westwork. |
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Scones sold commercially are usually round, although some brands are hexagonal as this shape may be tessellated for space efficiency. |
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With a monkey wrench on the hexagonal part of the stuffing box unscrew the stuffing box from the body of the faucet. |
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The plesiohedra include such well-known shapes as the cube, hexagonal prism, rhombic dodecahedron, and truncated octahedron. |
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However, the grain size changes in other ceramic materials, like tetragonal zirconia and hexagonal alumina, were not statistically significant. |
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The most common type of pencil casing is of thin wood, usually hexagonal in section but sometimes cylindrical, permanently bonded to the core. |
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The enclosed biomes are made of plastic, hexagonal panels that are inflated to trap heat, maintaining temperatures for the greenhouse's plants. |
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Depending on the cooling procedure, crystals will either have a hexagonal arrangement, or a triclinic one. |
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The predicted ejections of triangular, box, and hexagonal molds appear higher than the experimental values. |
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Cold temperatures and blown snow had penetrated the porous lava, forming regular, roughly hexagonal cracks almost like frost heaves on asphalt. |
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Such motion may be facilitated by lattice distortions in the hexagonal hydrogen planes in a manner similar to that observed in graphite intercalation compounds. |
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The large mirror on the ELT, made up from nearly 800 hexagonal segments, will gather 12 times more light than the largest optical telescopes operating today. |
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The egg chorion surface showed a chorionic pattern resulting in irregular hexagonal patterns There were 18-19 short pipe micropylar projections mounted at the anterior pole. |
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From Balla's original sketches, Gatti reproduced motifs on cachepots, tiles, plates and a coffee service in a daring hexagonal form that resembled a mechanical bolt. |
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The torch was at the World Heritage site's hexagonal columns of rock, held aloft by Denis Broderick high above the Atlantic on Carrick a Rede rope bridge. |
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Its hexagonal head is turned in a pre-drilled hole with an Allen key. |
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Fullerenes are truncated icosahedrons with 90 edges of equal length, 60 vertices, 20 hexagonal faces, and 12 pentagonal faces that form a closed shell. |
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Pencils are commonly round, hexagonal, or sometimes triangular in section. |
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Suitable collets may also be used to mount square or hexagonal workpieces. |
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They are made of simple ice crystals that are hexagonal in shape. |
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The thermally stimulated currents measured in hexagonal and cubic BaTiO3, however, show that both materials exhibit noncentric macroscopic symmetry. |
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