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More About White Opal
Precious opal consists of tiny, transparent spheres of hardened silica gel with water in the intervening spaces. Unless the silica spheres are precisely arranged and of the correct size, there is no color play, which is caused by the diffraction of light through the spheres. This makes the occurrence of opal extremely rare. Additionally, this gemstone can only form in an undisturbed space within another rock that is capable of holding a clean solution of silica from which water is slowly removed over the course of thousands of years. All precious opal is probably relatively young in geological terms, since it cannot withstand the heat and pressure of being underground for millions of years.
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