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Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2] This effect appears as a milky ...
The term opalescence is commonly used to describe this unique and beautiful phenomenon, which in gemology is termed play of color. In gemology, opalescence is applied to the hazy-milky-turbid sheen of common or potch opal which does not show a play of color. [clarification needed] Opalescence is a form of adularescence.
In physics, critical opalescence refers to the dramatic increase in scattering of light in the region of a continuous, or second-order, phase transition. Near the critical point , the properties of the liquid and gas phases become indistinguishable.
Iridescence in soap bubbles. Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear gradually to change colour as the angle of view or the angle of illumination changes.
Tyndall scattering, i.e. colloidal particle scattering, [7] is much more intense than Rayleigh scattering due to the bigger particle sizes involved. [ citation needed ] The importance of the particle size factor for intensity can be seen in the large exponent it has in the mathematical statement of the intensity of Rayleigh scattering.
The schiller is scattered by inclusions and appears hazy; non-hazy specimens are specially referred to as "milky". Thus, adularescence occurring in non-adularia gemstones is termed differently – the "girasol effect" and opalescence (for opals only) are two such terms.
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Critical point (32.17 °C, 48.72 bar), displaying critical opalescence. ... does not hold near the critical point. In particular, it predicts wrong scaling laws.
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