BLACK OPAL
There are two varieties, the common Opal no-iridescent and often opaque, and noble Opal (say précious) with changing iridescent colors depending on the angle of view. The noble Opal can have 200 different iridescent colors. Their iridescence car form splendid designs. More the spheres of the Opal are big, more the panoply of colour is larger. Australia is the first producer for XIXth century.
Classic view
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