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.
- 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.
- Crystals and fine-grained masses of vivianite are present.
Early 19th century: named after John H. Vivian (1785–1855), British mineralogist, + -ite1.
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