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The name is a derivitave of the Indian word "stone". There are three groups of Opal: the opalescent precious Opals, special for their rainbow iridescence which changes with the angle of observation; the yellow fire opals, named after their orange color; and the common opal, which is mostly opaque and without play of color. It is most common. All opals have a measure of water in them ranging up to 30%. Opals can lose their water, thus dulling their color. The water can escape through cracks in the stone or evaporate from even a little heat. Their color can be temporarily restored by saturating them with water or oil. Opals are very brittle and are sensitive to knocks, pressure, heat acids, and alkalies.