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Opal Physical - Optical Properties, Formation, Uses, …

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WebMineralogically, opal is a hydrous silicon dioxide with a chemical composition of SiO 2. nH 2 O. It is amorphous, without a crystalline structure, and without a definite chemical … Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being mo… http://www.allegroyarns.com/ closest radiology