Opal consists of hardened silica combined with water. Opal occurs in many different colors including white, orange, gray and black. An opal's internal structure determines the opalescence, "rainbow" or play-of-color; based upon the individual silica spheres alignment. Opals are unique in that their play-of-color changes as the light strikes; shades of yellow, orange, red, blue and green dazzle the eye. Boulder opal is a particular variety consisting of a slice of opal with its natural matrix rock attached.
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