opal

Noun
  1. A translucent mineral consisting of hydrated silica of variable color;
    Some varieties are used as gemstones (synset 114712395)
    is a type of:
    • mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    • opaque gem - a gemstone that is opaque
    subtypes:
    • black opal - a dark colored opal with internal reflections of green or red
    • fire opal, girasol - an opal with flaming orange and yellow and red colors
    • harlequin opal - a reddish opal with small patches of brilliant color

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