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benitoite

[buh-nee-toh-ahyt]
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noun
  1. a rare mineral, barium titanium silicate, BaTiSi3O9, occurring in blue hexagonal crystals exhibiting dichroism.

Origin of benitoite

1905–10; named after San Benito County, California; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018