Consequently, the solution conditions should disfavor the first step ( nucleation ) but favor the second ( growth ), so that only one large crystal forms per droplet.

Books of instruction in the art of crystal gazing often suggest that the ball used should be perfectly spherical ( that is, without a flat bottom ) and should be supported in a wooden or metal stand.

If made of glass ( e. g. lead crystal ), it should be free from air bubbles but may be colored.

Most authors suggest that the work of crystal gazing should be undertaken in a dimly-lit and quiet room, so as to foster visions and more easily allow the onset of a trance state.

Similarly, he claimed that the anatase in the ink could have come from sand used to dry it ( the hypothetical source of the sand being gneiss from the Binnenthal area of Switzerland ) but his team had not examined the crystals microscopically, and Kenneth Towe responded that this was an essential test, given that crystal size and shape should clearly distinguish commercial anatase from anatase found in sand.

The leaves contain calcium oxalate crystals and crystal raphide, and should not be consumed by humans.

Lead crystal should not be cleaned in a dishwasher as the corrosive effect of dishwasher detergent is high on such types of glass – that is, it will quickly go ' cloudy '.

Pyroelectricity should not be confused with thermoelectricity: In a typical demonstration of pyroelectricity, the whole crystal is changed from one temperature to another, and the result is a temporary voltage across the crystal.

The coffin should be of crystal, stone or hard fine wood.

The combination of components should have negative heat of mixing, inhibiting crystal nucleation and prolongs the time the molten metal stays in supercooled state.

While gazing at the lawn ornament, Mrs. Davenport commented that since Davenport and Sherrill felt cleanliness was a cornerstone of the concept, they should name the restaurant Crystal for " clean as a crystal "-yet with a " K " to add a little twist.

Also remember that an Accutron with a 224 movement, which should be labeled " Accuquartz " on its dial, is a hybrid movement, with its timekeeping actually regulated by a quartz crystal rather than by the tuning fork itself, but many consider these to be collectible because they were only made for 5 years, resulting in a low total production number and corresponding rarity today.

She asked too, that the lake would never become dry and that the waters should always be pure and crystal.

The lack of cleavage, commonly euhedral crystal morphology, and mineral associations should also be used in identification of pyrope under the microscope.

* Pearl, often considered a mineral due to crystal components, but then not a mineral due to organic origin, probably should be a mineraloid.

The body should be wrapped in a shroud of silk or cotton and placed in a coffin made of polished stone, crystal or hard wood.

In retrospect, Schrödinger's aperiodic crystal can be viewed as a well-reasoned theoretical prediction of what biologists should have been looking for during their search for genetic material.

* Gualsinga River, should be called " the crystal river " due to this is one of the last cristalin water in the country.

Sonar can be used to measure the thickness of the heart by placing small crystal transducers at opposite sides of the heart or blood vessel and exciting one with some pulsed ultrasonic energy.

Af appeared to be well suited for the study of these matters, since it is a normal paramagnet, with three unpaired electrons on the chromium, its crystal structure is very simple, and the unknown position of the hydrogen in the strong Af bond provides structural interest.

Most metals and alloys can be work hardened by creating defects in their crystal structure.

There is one test based on " Brazil law twinning " ( a form of quartz twinning where right and left hand quartz structures are combined in a single crystal ) which can be used to identify synthetic amethyst rather easily.

While the speed of communication is important, so is the fact that the messages cannot be overheard except by listeners with a piece of the original crystal.

Unlike McCaffrey's black crystal transceivers, Le Guin's ansibles are not mated pairs: it is possible for an ansible's coordinates to be set to any known location of a receiving ansible.

A colloidal crystal is a highly ordered array of particles that can be formed over a very long range ( typically on the order of a few millimeters to one centimeter ) and that appear analogous to their atomic or molecular counterparts.

Several kinds of descriptive categorizations can be applied broadly to the elements, including consideration of their general physical and chemical properties, their states of matter under familiar conditions, their melting and boiling points, their densities, their crystal structures as solids, and their origins.

Single crystal diamond can be made containing various dopants.

The number of ligands that react with a central metal atom can be found using the 18-electron rule, saying that the valence shells of a transition metal will collectively accommodate 18 electrons, whereas the symmetry of the resulting complex can be predicted with the crystal field theory and ligand field theory.

The final plot allows the symmetry of the crystal to be established.

This can continue to the point of complete breakdown of normal resistance at a semiconductor junction, and failure of the device ( this may be temporary or permanent depending on whether there is physical damage to the crystal ).

* Vacancy defects are lattice sites which would be occupied in a perfect crystal, but are vacant.

The atom is not supposed to be anywhere in the crystal, and is thus an impurity.

The crystal detector in these early crystal radio sets consisted of an adjustable wire point-contact ( the so-called " cat's whisker "), which could be manually moved over the face of the crystal in order to obtain optimum signal.

The advantages of electron diffraction over X-ray crystallography are that the specimen need not be a single crystal or even a polycrystalline powder, and also that the Fourier transform reconstruction of the object's magnified structure occurs physically and thus avoids the need for solving the phase problem faced by the X-ray crystallographers after obtaining their X-ray diffraction patterns of a single crystal or polycrystalline powder.

This relative crystal non-uniformity makes emeralds more likely than other gemstones to be cut into cabochons, rather than faceted shapes.

A shell is said to be recrystallized when the original skeletal compounds are still present but in a different crystal form, as from aragonite to calcite.

When the string vibrates, the shape of the crystal is distorted, and the stresses associated with this change produce tiny voltages across the crystal that can be amplified and manipulated.

Glass can also be cut with a diamond saw, or copper wheels embedded with abrasives, and polished to give gleaming facets ; the technique used in creating Waterford crystal.

Internal reflections can escape through other crystalline faces, if the incidence angle is low enough and the crystal is sufficiently transparent to not re-absorb the photon emission.

At a certain temperature, the crystal structure has formed sufficiently to prevent diffusion of isotopes.

In general, single-crystal X-ray diffraction offers more structural information than these other techniques ; however, it requires a sufficiently large and regular crystal, which is not always available.

Any sufficiently thick crystal will produce secondary scattering, but since X-rays interact relatively weakly with the electrons, this is generally not a significant concern.

Monodisperse powders of colloidal silica, for example, may therefore be stabilized sufficiently to ensure a high degree of order in the colloidal crystal or polycrystalline colloidal solid which results from aggregation.

Monodisperse powders of colloidal silica, for example, may therefore be stabilized sufficiently to ensure a high degree of order in the colloidal crystal or polycrystalline colloidal solid which results from aggregation.

Monodisperse powders of colloidal silica, for example, may therefore be stabilized sufficiently to ensure a high degree of order in the colloidal crystal or polycrystalline colloidal solid which results from aggregation.