vivianite

[ viv-ee-uh-nahyt ]

/ ˈvɪv i əˌnaɪt /

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noun

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