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(Minerals) a deep blue variety of the mineral cordierite that occurs in Sri Lanka: used as a gemstone
a transparent variety of cordierite sometimes used as a gem.
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|Noun||1.||water sapphire - a deep blue cordierite often used as a gemstone|
cordierite - a blue mineral of magnesium and iron and aluminum and silicon and oxygen; often used as a gemstone
transparent gem - a gemstone having the property of transmitting light without serious diffusion