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vivianite

[viv-ee-uh-nahyt]
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noun
  1. a secondary mineral, hydrous ferrous phosphate, Fe3(PO4)2⋅8H2O, occurring in the form of pale blue crystals or powder.
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Origin of vivianite

1815–25; named after J. G. Vivian, 19th-century English mineralogist, who found it; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018