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[mass noun] A mineral consisting of a phosphate of iron which occurs as a secondary mineral in ore deposits. It is colourless when fresh but becomes blue or green with oxidization.
- ‘Crystals and fine-grained masses of vivianite are present.’
- ‘This polished section of a tooth crown reveals figure-eight patterns of the blue mineral vivianite, a phosphate of iron.’
- ‘Occurrences of gypsum crystals and vivianite in drift are also noteworthy.’
- ‘The vivianite occurs in small earthy-blue masses perched on fragments of fossil wood.’
- ‘The quarry has yielded fine specimens of eosphorite, fairfieldite, montebrasite, roscherite, and vivianite.’
Early 19th century: named after John H. Vivian (1785–1855), British mineralogist, + -ite.
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