topaz is an aluminum fluorosilicate, Al2SiO4(F,OH)2
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aluminium fluosilicate or aluminium silicofluoride is a
comppound with fomrula Al2(SiF6)3, white powder, slightly soluble
in coldwater, readily soluble in hot water; use: artificial gems,
enamls, glass
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The scientific name of topaz is "Aluminum fluorosilicate."
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soft glass
Hard glass
crown glass
flint glass
glass ceramics etc
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Glass is an amorphous or transparent solid. Glass is also called
supercooled liquid. Types of glasses are : soft glass, hard glass,
crook's glass, jena glass, glass laminates