HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Opal

Opal is a silicate that usually contains iron and aluminum. Opals can vary in colour, but all have a pearly luster. Dark-coloured opal is called black opal; this is the most precious. Light-coloured opal is white opal, and yellow-orange to red opal is fire opal. Opal can be found in many rock cavities, but precious opal is believed to be limited to Mexico and the western U.S.A. [LM] {CC} {SS}
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