vivianite

American

[viv-ee-uh-nahyt] / ˈvɪv i əˌnaɪt /

noun

a secondary mineral, hydrous ferrous phosphate, Fe 3 (PO4 ) 2 ⋅8H 2 O, occurring in the form of pale blue crystals or powder.

1815–25; named after J. G. Vivian, 19th-century English mineralogist, who found it; see -ite ¹

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