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► Size: approximately 40-50mm
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► Material:Green opal
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► Weight:1kg
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► Introduction:Green Opal Sphere (Madagascar) 'A' Grade - Opal is a hydrated silicon dioxide material with a hardness of 5.5 . Opal is composed of sub-microscopic silica spheres that are bonded together with water and additional silica. In Roman history Opal was linked to good luck and hope. This lovely example is from Madagascar, there a three small natural cavities to the surface of the sphere, adding to it's natural character.