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opal

DEFINITIONS OF: opal

1

n a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones

Types:
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
Type of:
mineral
solid homogeneous inorganic substances occurring in nature having a definite chemical composition
opaque gem
a gemstone that is opaque
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