Opals are precious multicolored gemstones made primarily of silica. How do they form? Scientists admit that much of the chemistry is not well understood. However, according to the traditional explanation, their formation begins as water filters through silica-rich rock, dissolving some of the silica. When that water passes through a cavity in a suitable rock, the silica precipitates as a film on the wall of the cavity. After tens of millions of years, say the scientists, you will have an opal.
Read more here: Creation Moments
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