water sapphire

water sapphire

noun
a transparent variety of cordierite, found in Sri Lanka, Madagascar, and elsewhere, sometimes used as a gem.

Origin:
1690–1700

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World English Dictionary
water sapphire
 
n
a deep blue variety of the mineral cordierite that occurs in Sri Lanka: used as a gemstone

Collins English Dictionary - Complete & Unabridged 10th Edition
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