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Note that fused quartz has a very different and lower refractive index compared to crystalline quartz which is birefringent with refractive indices n o = 1.5443 and n e = 1.5534 at the same wavelength. Although these forms have the same chemical formula, their differing structures result in different optical and other physical properties.
In the self-glazing process of efflorescence, the glazing materials, in the form of water-soluble alkali salts, are mixed with the raw crushed quartz of the core of the object. [15] [16] [25] As the water in the body evaporates, the salts migrate to the surface of the object to recrystallize, creating a thin surface, which glazes upon firing. [14]
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Raw materials for ceramic glazes generally include silica, which will be the main glass former. Various metal oxides, such as those of sodium, potassium and calcium, act as flux and therefore lower the melting temperature. Alumina, often derived from clay, stiffens the molten glaze to prevent it from running off the piece. [7]
Rose quartz is a type of quartz which exhibits a pale pink to rose red hue. Rose Quartz may also refer to: Rose quartz (color), a gray shade of magenta; Rose Quartz (Fabergé egg) Rose Quartz (My Little Pony), one of the Crystal Ponies from the My Little Pony franchise "Rose Quartz", a song by Toro y Moi from their album Anything in Return ...
Fused quartz is used for high-temperature applications such as furnace tubes, lighting tubes, melting crucibles, etc. [74] However, its high melting temperature (1723 °C) and viscosity make it difficult to work with. Therefore, normally, other substances (fluxes) are added to lower the melting temperature and simplify glass processing.