Opal, also called noble opal in mineralogy, is a kind of silica which is hydrous and non-crystalline and its chemical formula is SiO2•nH2O. The water content is usually 3% - 10%.
Opal deserves a सीट in the तालिका, टेबल of gemstone kingdom for its beautiful and charming changing रंग and its unique attraction. It has the flame of the ruby, the bright purple of the amethyst and the jade green of the emerald, combining the gorgeousness of ruby, the grace of amethyst and the charming of emerald. Opal is regarded as the symbol of hope and purity. The artist once used such poetic words and phrases to...
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