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Description: Spectrum - Max CoopernnnAn opal is more then a gemstone.nThey are unique minerals which are created by nature in a special way.nOpals are formed by accumulations of siliceous fluid in various rocks. They are formed either in sedimentary rocks or hydrothermally in volcanic rocks, such as in tuff, but they can also form from organic material over millions of years. After they are fully formed they still have up to 20% water.nnMy father collects rough crystal opals and refines them into beaut
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