Vivianite ({Chem|Fe|2+|Fe|2+|2|(PO|4|)|2|·8H|2|O}) is a hydrated iron phosphate mineral found in a number of geological environments. Small amounts of manganese Mn2+, magnesium Mg and calcium Ca may substitute for iron Fe2+ in the structure. Pure fresh vivianite is colorless, but the mineral oxidizes very easily, changing the color, and it is usu...
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http://en.wikipedia.org/wiki/Vivianite
• (n.) A hydrous phosphate of iron of a blue to green color, growing darker on exposure. It occurs in monoclinic crystals, also fibrous, massive, and earthy.
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http://thinkexist.com/dictionary/meaning/vivianite/
phosphate mineral, hydrated iron phosphate [Fe3(PO4)28H2O], that occurs as colourless (when freshly exposed) or dark-blue (after long exposure), ...
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http://www.britannica.com/eb/a-z/v/31
Viv'i·an·ite noun [ So called by Werner after the English mineralogist F. German
Vivian .]
(Min.) A hydrous phosphate of iron of a blue to green color, growing darker on exposure. It occurs in monoclinic crystals, also fibrous, massive, and earthy.
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http://www.encyclo.co.uk/webster/V/32
Vivianite, named after the English mineralogist J G Vivian who discovered the mineral in Cornwall, England, is a rare mineral of secondary origin, associated with pyrite in copper and tin veins. It forms as a weathering product from primary iron- manganese phosphates in pegmatites, and is a hydrous phosphate of iron of a blue to green colour, growi...
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http://www.probertencyclopaedia.com/browse/HV.HTM
Iron orthophosphate
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