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gravel in sri lanka

Sep 30, 2014 Gemstone mining in Sri Lanka is mostly from secondary deposits. The gravels yield sapphire, ruby, cats-eye and other chrysoberyls, spinel, garnet, beryl, tourmaline, topaz, quartz, and many other gemstones. Sri Lankas gem-bearing gravels, called illam, are some of the richest in the world. The island was blessed with geological conditions ...

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